Added explicit sequences on a few primary keys and minor fixes wrt Firebird
Added explicit sequences on a few primary keys and minor fixes wrt Firebird

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