- rework documentation for reflection flags; also include information regarding #3027.
- rework documentation for reflection flags; also include
information regarding #3027.

dstufft/sqlalchemy,hsum/sqlalchemy,j5int/sqlalchemy,olemis/sqlalchemy,bdupharm/sqlalchemy,olemis/sqlalchemy,halfcrazy/sqlalchemy,hsum/sqlalchemy,graingert/sqlalchemy,sqlalchemy/sqlalchemy,elelianghh/sqlalchemy,276361270/sqlalchemy,pdufour/sqlalchemy,elelianghh/sqlalchemy,ThiefMaster/sqlalchemy,brianv0/sqlalchemy,wujuguang/sqlalchemy,itkovian/sqlalchemy,EvaSDK/sqlalchemy,dstufft/sqlalchemy,inspirehep/sqlalchemy,bdupharm/sqlalchemy,zzzeek/sqlalchemy,epa/sqlalchemy,robin900/sqlalchemy,wujuguang/sqlalchemy,Akrog/sqlalchemy,276361270/sqlalchemy,epa/sqlalchemy,j5int/sqlalchemy,halfcrazy/sqlalchemy,itkovian/sqlalchemy,robin900/sqlalchemy,WinterNis/sqlalchemy,wfxiang08/sqlalchemy,sandan/sqlalchemy,davidfraser/sqlalchemy,bootandy/sqlalchemy,WinterNis/sqlalchemy,sandan/sqlalchemy,davidjb/sqlalchemy,brianv0/sqlalchemy,EvaSDK/sqlalchemy,graingert/sqlalchemy,monetate/sqlalchemy,pdufour/sqlalchemy,bootandy/sqlalchemy,ThiefMaster/sqlalchemy,Akrog/sqlalchemy,monetate/sqlalchemy,davidfraser/sqlalchemy,wfxiang08/sqlalchemy,inspirehep/sqlalchemy,davidjb/sqlalchemy