chain: Set all CBlockIndex members to null, remove SetNull helper
chain: Set all CBlockIndex members to null, remove SetNull helper

n1bor/bitcoin,jonasschnelli/bitcoin,jamesob/bitcoin,GroestlCoin/GroestlCoin,ElementsProject/elements,yenliangl/bitcoin,sipsorcery/bitcoin,bitcoin/bitcoin,bitcoinknots/bitcoin,cdecker/bitcoin,andreaskern/bitcoin,andreaskern/bitcoin,jlopp/statoshi,rnicoll/dogecoin,apoelstra/bitcoin,bitcoinknots/bitcoin,bitcoinsSG/bitcoin,gjhiggins/vcoincore,DigitalPandacoin/pandacoin,mruddy/bitcoin,lateminer/bitcoin,dscotese/bitcoin,tecnovert/particl-core,DigitalPandacoin/pandacoin,namecoin/namecoin-core,namecoin/namecoin-core,yenliangl/bitcoin,bitcoinknots/bitcoin,JeremyRubin/bitcoin,bitcoinsSG/bitcoin,midnightmagic/bitcoin,tecnovert/particl-core,pataquets/namecoin-core,GroestlCoin/GroestlCoin,jamesob/bitcoin,cdecker/bitcoin,tjps/bitcoin,achow101/bitcoin,domob1812/namecore,MarcoFalke/bitcoin,vertcoin/vertcoin,domob1812/namecore,AkioNak/bitcoin,kallewoof/bitcoin,MeshCollider/bitcoin,fanquake/bitcoin,namecoin/namecore,andreaskern/bitcoin,ahmedbodi/vertcoin,AkioNak/bitcoin,monacoinproject/monacoin,qtumproject/qtum,MarcoFalke/bitcoin,achow101/bitcoin,vertcoin/vertcoin,tjps/bitcoin,gjhiggins/vcoincore,tecnovert/particl-core,bitcoinsSG/bitcoin,n1bor/bitcoin,sipsorcery/bitcoin,dscotese/bitcoin,alecalve/bitcoin,practicalswift/bitcoin,rnicoll/bitcoin,monacoinproject/monacoin,qtumproject/qtum,Sjors/bitcoin,achow101/bitcoin,litecoin-project/litecoin,rnicoll/bitcoin,yenliangl/bitcoin,cdecker/bitcoin,kallewoof/bitcoin,kallewoof/bitcoin,domob1812/bitcoin,fujicoin/fujicoin,jnewbery/bitcoin,sstone/bitcoin,jambolo/bitcoin,rnicoll/bitcoin,qtumproject/qtum,GroestlCoin/bitcoin,sipsorcery/bitcoin,domob1812/bitcoin,fanquake/bitcoin,pataquets/namecoin-core,domob1812/bitcoin,namecoin/namecoin-core,bitcoinsSG/bitcoin,MarcoFalke/bitcoin,namecoin/namecore,Sjors/bitcoin,ajtowns/bitcoin,tjps/bitcoin,mruddy/bitcoin,domob1812/namecore,andreaskern/bitcoin,dscotese/bitcoin,Sjors/bitcoin,ahmedbodi/vertcoin,fanquake/bitcoin,DigitalPandacoin/pandacoin,practicalswift/bitcoin,pstratem/bitcoin,Xekyo/bitcoin,andreaskern/bitcoin,jamesob/bitcoin,domob1812/namecore,GroestlCoin/GroestlCoin,MarcoFalke/bitcoin,qtumproject/qtum,namecoin/namecoin-core,peercoin/peercoin,dscotese/bitcoin,sstone/bitcoin,particl/particl-core,rnicoll/bitcoin,fujicoin/fujicoin,midnightmagic/bitcoin,anditto/bitcoin,ElementsProject/elements,alecalve/bitcoin,monacoinproject/monacoin,bitcoin/bitcoin,pstratem/bitcoin,fujicoin/fujicoin,bitcoinsSG/bitcoin,tjps/bitcoin,namecoin/namecore,anditto/bitcoin,dscotese/bitcoin,tjps/bitcoin,mitchellcash/bitcoin,peercoin/peercoin,rnicoll/dogecoin,namecoin/namecore,ElementsProject/elements,namecoin/namecoin-core,rnicoll/dogecoin,jlopp/statoshi,gjhiggins/vcoincore,jambolo/bitcoin,jamesob/bitcoin,apoelstra/bitcoin,achow101/bitcoin,lateminer/bitcoin,sipsorcery/bitcoin,DigitalPandacoin/pandacoin,ElementsProject/elements,gjhiggins/vcoincore,Xekyo/bitcoin,AkioNak/bitcoin,EthanHeilman/bitcoin,pataquets/namecoin-core,MeshCollider/bitcoin,particl/particl-core,mitchellcash/bitcoin,GroestlCoin/bitcoin,rnicoll/dogecoin,JeremyRubin/bitcoin,anditto/bitcoin,jonasschnelli/bitcoin,gjhiggins/vcoincore,jlopp/statoshi,pstratem/bitcoin,jlopp/statoshi,alecalve/bitcoin,MeshCollider/bitcoin,ajtowns/bitcoin,yenliangl/bitcoin,AkioNak/bitcoin,midnightmagic/bitcoin,prusnak/bitcoin,n1bor/bitcoin,practicalswift/bitcoin,fanquake/bitcoin,pstratem/bitcoin,instagibbs/bitcoin,mruddy/bitcoin,jamesob/bitcoin,jambolo/bitcoin,jnewbery/bitcoin,alecalve/bitcoin,GroestlCoin/bitcoin,jonasschnelli/bitcoin,bitcoin/bitcoin,peercoin/peercoin,Xekyo/bitcoin,ahmedbodi/vertcoin,prusnak/bitcoin,sipsorcery/bitcoin,domob1812/namecore,mruddy/bitcoin,mitchellcash/bitcoin,ElementsProject/elements,monacoinproject/monacoin,jlopp/statoshi,fujicoin/fujicoin,sstone/bitcoin,practicalswift/bitcoin,dscotese/bitcoin,apoelstra/bitcoin,practicalswift/bitcoin,EthanHeilman/bitcoin,mm-s/bitcoin,AkioNak/bitcoin,anditto/bitcoin,rnicoll/dogecoin,GroestlCoin/bitcoin,instagibbs/bitcoin,JeremyRubin/bitcoin,kallewoof/bitcoin,rnicoll/bitcoin,MeshCollider/bitcoin,prusnak/bitcoin,DigitalPandacoin/pandacoin,particl/particl-core,mm-s/bitcoin,GroestlCoin/bitcoin,peercoin/peercoin,n1bor/bitcoin,vertcoin/vertcoin,namecoin/namecore,ajtowns/bitcoin,mitchellcash/bitcoin,bitcoin/bitcoin,cdecker/bitcoin,cdecker/bitcoin,JeremyRubin/bitcoin,rnicoll/bitcoin,MeshCollider/bitcoin,sstone/bitcoin,AkioNak/bitcoin,tecnovert/particl-core,ElementsProject/elements,tecnovert/particl-core,JeremyRubin/bitcoin,jambolo/bitcoin,Sjors/bitcoin,litecoin-project/litecoin,mm-s/bitcoin,litecoin-project/litecoin,gjhiggins/vcoincore,mruddy/bitcoin,jnewbery/bitcoin,midnightmagic/bitcoin,MarcoFalke/bitcoin,mm-s/bitcoin,GroestlCoin/GroestlCoin,jonasschnelli/bitcoin,anditto/bitcoin,ahmedbodi/vertcoin,pataquets/namecoin-core,monacoinproject/monacoin,EthanHeilman/bitcoin,lateminer/bitcoin,practicalswift/bitcoin,yenliangl/bitcoin,n1bor/bitcoin,mitchellcash/bitcoin,mruddy/bitcoin,apoelstra/bitcoin,qtumproject/qtum,midnightmagic/bitcoin,fanquake/bitcoin,monacoinproject/monacoin,pataquets/namecoin-core,jamesob/bitcoin,pstratem/bitcoin,instagibbs/bitcoin,Sjors/bitcoin,vertcoin/vertcoin,pstratem/bitcoin,pataquets/namecoin-core,kallewoof/bitcoin,tjps/bitcoin,namecoin/namecore,andreaskern/bitcoin,bitcoinknots/bitcoin,mm-s/bitcoin,ajtowns/bitcoin,mm-s/bitcoin,particl/particl-core,Xekyo/bitcoin,apoelstra/bitcoin,instagibbs/bitcoin,EthanHeilman/bitcoin,jonasschnelli/bitcoin,EthanHeilman/bitcoin,GroestlCoin/bitcoin,vertcoin/vertcoin,fujicoin/fujicoin,jnewbery/bitcoin,jlopp/statoshi,yenliangl/bitcoin,namecoin/namecoin-core,lateminer/bitcoin,domob1812/bitcoin,JeremyRubin/bitcoin,litecoin-project/litecoin,instagibbs/bitcoin,EthanHeilman/bitcoin,peercoin/peercoin,ahmedbodi/vertcoin,ajtowns/bitcoin,litecoin-project/litecoin,GroestlCoin/GroestlCoin,domob1812/bitcoin,lateminer/bitcoin,achow101/bitcoin,peercoin/peercoin,GroestlCoin/GroestlCoin,prusnak/bitcoin,vertcoin/vertcoin,anditto/bitcoin,sstone/bitcoin,Xekyo/bitcoin,midnightmagic/bitcoin,MarcoFalke/bitcoin,sipsorcery/bitcoin,alecalve/bitcoin,instagibbs/bitcoin,cdecker/bitcoin,DigitalPandacoin/pandacoin,tecnovert/particl-core,fujicoin/fujicoin,achow101/bitcoin,fanquake/bitcoin,jnewbery/bitcoin,prusnak/bitcoin,domob1812/bitcoin,jambolo/bitcoin,lateminer/bitcoin,ajtowns/bitcoin,mitchellcash/bitcoin,particl/particl-core,kallewoof/bitcoin,bitcoin/bitcoin,sstone/bitcoin,bitcoinsSG/bitcoin,domob1812/namecore,bitcoin/bitcoin,apoelstra/bitcoin,Xekyo/bitcoin,particl/particl-core,qtumproject/qtum,MeshCollider/bitcoin,alecalve/bitcoin,prusnak/bitcoin,litecoin-project/litecoin,n1bor/bitcoin,ahmedbodi/vertcoin,jambolo/bitcoin,bitcoinknots/bitcoin,qtumproject/qtum