Some more constification of fields in data_block_manager.
Some more constification of fields in data_block_manager.

dparnell/rethinkdb,gavioto/rethinkdb,Wilbeibi/rethinkdb,rrampage/rethinkdb,marshall007/rethinkdb,RubenKelevra/rethinkdb,losywee/rethinkdb,elkingtonmcb/rethinkdb,victorbriz/rethinkdb,mbroadst/rethinkdb,gavioto/rethinkdb,4talesa/rethinkdb,greyhwndz/rethinkdb,spblightadv/rethinkdb,jfriedly/rethinkdb,yakovenkodenis/rethinkdb,niieani/rethinkdb,captainpete/rethinkdb,alash3al/rethinkdb,bchavez/rethinkdb,ayumilong/rethinkdb,urandu/rethinkdb,AntouanK/rethinkdb,tempbottle/rethinkdb,lenstr/rethinkdb,matthaywardwebdesign/rethinkdb,JackieXie168/rethinkdb,catroot/rethinkdb,bpradipt/rethinkdb,greyhwndz/rethinkdb,yaolinz/rethinkdb,wojons/rethinkdb,yakovenkodenis/rethinkdb,grandquista/rethinkdb,spblightadv/rethinkdb,tempbottle/rethinkdb,nviennot/rethinkdb,grandquista/rethinkdb,wkennington/rethinkdb,ayumilong/rethinkdb,greyhwndz/rethinkdb,KSanthanam/rethinkdb,lenstr/rethinkdb,RubenKelevra/rethinkdb,sebadiaz/rethinkdb,ajose01/rethinkdb,gdi2290/rethinkdb,alash3al/rethinkdb,alash3al/rethinkdb,niieani/rethinkdb,victorbriz/rethinkdb,scripni/rethinkdb,gdi2290/rethinkdb,wkennington/rethinkdb,pap/rethinkdb,pap/rethinkdb,ayumilong/rethinkdb,niieani/rethinkdb,jmptrader/rethinkdb,grandquista/rethinkdb,rrampage/rethinkdb,jfriedly/rethinkdb,yaolinz/rethinkdb,nviennot/rethinkdb,jesseditson/rethinkdb,wkennington/rethinkdb,urandu/rethinkdb,RubenKelevra/rethinkdb,mcanthony/rethinkdb,pap/rethinkdb,alash3al/rethinkdb,sontek/rethinkdb,jfriedly/rethinkdb,urandu/rethinkdb,AntouanK/rethinkdb,eliangidoni/rethinkdb,sbusso/rethinkdb,jmptrader/rethinkdb,mcanthony/rethinkdb,AntouanK/rethinkdb,Wilbeibi/rethinkdb,dparnell/rethinkdb,wojons/rethinkdb,marshall007/rethinkdb,sbusso/rethinkdb,sontek/rethinkdb,KSanthanam/rethinkdb,elkingtonmcb/rethinkdb,RubenKelevra/rethinkdb,ayumilong/rethinkdb,mcanthony/rethinkdb,jfriedly/rethinkdb,wujf/rethinkdb,RubenKelevra/rethinkdb,Wilbeibi/rethinkdb,eliangidoni/rethinkdb,bpradipt/rethinkdb,sebadiaz/rethinkdb,gavioto/rethinkdb,nviennot/rethinkdb,robertjpayne/rethinkdb,captainpete/rethinkdb,ajose01/rethinkdb,eliangidoni/rethinkdb,scripni/rethinkdb,gdi2290/rethinkdb,alash3al/rethinkdb,marshall007/rethinkdb,yakovenkodenis/rethinkdb,4talesa/rethinkdb,tempbottle/rethinkdb,JackieXie168/rethinkdb,JackieXie168/rethinkdb,robertjpayne/rethinkdb,urandu/rethinkdb,ajose01/rethinkdb,jesseditson/rethinkdb,tempbottle/rethinkdb,jfriedly/rethinkdb,sbusso/rethinkdb,dparnell/rethinkdb,gavioto/rethinkdb,matthaywardwebdesign/rethinkdb,pap/rethinkdb,grandquista/rethinkdb,Qinusty/rethinkdb,JackieXie168/rethinkdb,ajose01/rethinkdb,sontek/rethinkdb,wujf/rethinkdb,sebadiaz/rethinkdb,scripni/rethinkdb,losywee/rethinkdb,jmptrader/rethinkdb,sebadiaz/rethinkdb,wujf/rethinkdb,sebadiaz/rethinkdb,mcanthony/rethinkdb,sontek/rethinkdb,nviennot/rethinkdb,niieani/rethinkdb,JackieXie168/rethinkdb,greyhwndz/rethinkdb,jmptrader/rethinkdb,jfriedly/rethinkdb,eliangidoni/rethinkdb,victorbriz/rethinkdb,AtnNn/rethinkdb,gdi2290/rethinkdb,losywee/rethinkdb,captainpete/rethinkdb,wujf/rethinkdb,Wilbeibi/rethinkdb,Wilbeibi/rethinkdb,rrampage/rethinkdb,rrampage/rethinkdb,robertjpayne/rethinkdb,tempbottle/rethinkdb,spblightadv/rethinkdb,matthaywardwebdesign/rethinkdb,losywee/rethinkdb,grandquista/rethinkdb,grandquista/rethinkdb,Qinusty/rethinkdb,lenstr/rethinkdb,pap/rethinkdb,robertjpayne/rethinkdb,sbusso/rethinkdb,bpradipt/rethinkdb,mquandalle/rethinkdb,wujf/rethinkdb,4talesa/rethinkdb,elkingtonmcb/rethinkdb,losywee/rethinkdb,JackieXie168/rethinkdb,jesseditson/rethinkdb,yaolinz/rethinkdb,victorbriz/rethinkdb,alash3al/rethinkdb,mcanthony/rethinkdb,JackieXie168/rethinkdb,jfriedly/rethinkdb,robertjpayne/rethinkdb,robertjpayne/rethinkdb,AntouanK/rethinkdb,niieani/rethinkdb,lenstr/rethinkdb,sbusso/rethinkdb,Qinusty/rethinkdb,spblightadv/rethinkdb,urandu/rethinkdb,wojons/rethinkdb,matthaywardwebdesign/rethinkdb,wujf/rethinkdb,losywee/rethinkdb,yaolinz/rethinkdb,JackieXie168/rethinkdb,mcanthony/rethinkdb,nviennot/rethinkdb,nviennot/rethinkdb,mbroadst/rethinkdb,robertjpayne/rethinkdb,AtnNn/rethinkdb,scripni/rethinkdb,wkennington/rethinkdb,bchavez/rethinkdb,mquandalle/rethinkdb,spblightadv/rethinkdb,RubenKelevra/rethinkdb,mbroadst/rethinkdb,catroot/rethinkdb,elkingtonmcb/rethinkdb,rrampage/rethinkdb,sontek/rethinkdb,tempbottle/rethinkdb,KSanthanam/rethinkdb,sontek/rethinkdb,mbroadst/rethinkdb,wkennington/rethinkdb,bchavez/rethinkdb,jesseditson/rethinkdb,yakovenkodenis/rethinkdb,gdi2290/rethinkdb,grandquista/rethinkdb,bpradipt/rethinkdb,captainpete/rethinkdb,jfriedly/rethinkdb,victorbriz/rethinkdb,captainpete/rethinkdb,scripni/rethinkdb,Qinusty/rethinkdb,matthaywardwebdesign/rethinkdb,bchavez/rethinkdb,wkennington/rethinkdb,bchavez/rethinkdb,dparnell/rethinkdb,yakovenkodenis/rethinkdb,4talesa/rethinkdb,rrampage/rethinkdb,jesseditson/rethinkdb,AtnNn/rethinkdb,AntouanK/rethinkdb,scripni/rethinkdb,Qinusty/rethinkdb,sebadiaz/rethinkdb,wojons/rethinkdb,tempbottle/rethinkdb,AntouanK/rethinkdb,grandquista/rethinkdb,greyhwndz/rethinkdb,urandu/rethinkdb,victorbriz/rethinkdb,jesseditson/rethinkdb,wojons/rethinkdb,catroot/rethinkdb,ajose01/rethinkdb,marshall007/rethinkdb,Wilbeibi/rethinkdb,nviennot/rethinkdb,KSanthanam/rethinkdb,mbroadst/rethinkdb,losywee/rethinkdb,victorbriz/rethinkdb,AtnNn/rethinkdb,AtnNn/rethinkdb,niieani/rethinkdb,Qinusty/rethinkdb,dparnell/rethinkdb,lenstr/rethinkdb,ajose01/rethinkdb,jmptrader/rethinkdb,sbusso/rethinkdb,nviennot/rethinkdb,catroot/rethinkdb,jmptrader/rethinkdb,victorbriz/rethinkdb,sbusso/rethinkdb,KSanthanam/rethinkdb,catroot/rethinkdb,Wilbeibi/rethinkdb,jmptrader/rethinkdb,sbusso/rethinkdb,bpradipt/rethinkdb,pap/rethinkdb,jesseditson/rethinkdb,Qinusty/rethinkdb,greyhwndz/rethinkdb,lenstr/rethinkdb,matthaywardwebdesign/rethinkdb,marshall007/rethinkdb,JackieXie168/rethinkdb,yakovenkodenis/rethinkdb,4talesa/rethinkdb,AtnNn/rethinkdb,AtnNn/rethinkdb,mquandalle/rethinkdb,pap/rethinkdb,ajose01/rethinkdb,scripni/rethinkdb,gavioto/rethinkdb,bpradipt/rethinkdb,mbroadst/rethinkdb,eliangidoni/rethinkdb,matthaywardwebdesign/rethinkdb,wkennington/rethinkdb,AtnNn/rethinkdb,yakovenkodenis/rethinkdb,wojons/rethinkdb,gavioto/rethinkdb,catroot/rethinkdb,mquandalle/rethinkdb,elkingtonmcb/rethinkdb,sebadiaz/rethinkdb,spblightadv/rethinkdb,gavioto/rethinkdb,robertjpayne/rethinkdb,scripni/rethinkdb,elkingtonmcb/rethinkdb,spblightadv/rethinkdb,dparnell/rethinkdb,ajose01/rethinkdb,alash3al/rethinkdb,lenstr/rethinkdb,bpradipt/rethinkdb,Wilbeibi/rethinkdb,rrampage/rethinkdb,losywee/rethinkdb,catroot/rethinkdb,ayumilong/rethinkdb,4talesa/rethinkdb,Qinusty/rethinkdb,yaolinz/rethinkdb,yaolinz/rethinkdb,robertjpayne/rethinkdb,bchavez/rethinkdb,mquandalle/rethinkdb,sebadiaz/rethinkdb,Qinusty/rethinkdb,eliangidoni/rethinkdb,rrampage/rethinkdb,AntouanK/rethinkdb,KSanthanam/rethinkdb,gdi2290/rethinkdb,wojons/rethinkdb,RubenKelevra/rethinkdb,eliangidoni/rethinkdb,dparnell/rethinkdb,wkennington/rethinkdb,mquandalle/rethinkdb,niieani/rethinkdb,ayumilong/rethinkdb,elkingtonmcb/rethinkdb,yakovenkodenis/rethinkdb,gdi2290/rethinkdb,catroot/rethinkdb,captainpete/rethinkdb,AntouanK/rethinkdb,greyhwndz/rethinkdb,bpradipt/rethinkdb,pap/rethinkdb,marshall007/rethinkdb,dparnell/rethinkdb,wujf/rethinkdb,matthaywardwebdesign/rethinkdb,dparnell/rethinkdb,eliangidoni/rethinkdb,wojons/rethinkdb,alash3al/rethinkdb,yaolinz/rethinkdb,4talesa/rethinkdb,sontek/rethinkdb,RubenKelevra/rethinkdb,niieani/rethinkdb,KSanthanam/rethinkdb,bchavez/rethinkdb,marshall007/rethinkdb,ayumilong/rethinkdb,tempbottle/rethinkdb,bchavez/rethinkdb,urandu/rethinkdb,greyhwndz/rethinkdb,mquandalle/rethinkdb,captainpete/rethinkdb,eliangidoni/rethinkdb,jesseditson/rethinkdb,mcanthony/rethinkdb,mcanthony/rethinkdb,mbroadst/rethinkdb,sontek/rethinkdb,ayumilong/rethinkdb,captainpete/rethinkdb,bpradipt/rethinkdb,urandu/rethinkdb,mquandalle/rethinkdb,mbroadst/rethinkdb,4talesa/rethinkdb,bchavez/rethinkdb,spblightadv/rethinkdb,KSanthanam/rethinkdb,lenstr/rethinkdb,gavioto/rethinkdb,elkingtonmcb/rethinkdb,jmptrader/rethinkdb,yaolinz/rethinkdb,mbroadst/rethinkdb,grandquista/rethinkdb,marshall007/rethinkdb