refactoring of exception raising code, simpler/faster/correcter code for reraising exceptions, separate implementation for Py3, minor fixes for error cases
refactoring of exception raising code, simpler/faster/correcter code for reraising exceptions, separate implementation for Py3, minor fixes for error cases

hpfem/cython,acrispin/cython,fabianrost84/cython,ChristopherHogan/cython,madjar/cython,hhsprings/cython,marscher/cython,mcanthony/cython,JelleZijlstra/cython,achernet/cython,hhsprings/cython,roxyboy/cython,marscher/cython,ABcDexter/cython,dahebolangkuan/cython,larsmans/cython,ChristopherHogan/cython,madjar/cython,dahebolangkuan/cython,madjar/cython,fperez/cython,andreasvc/cython,ABcDexter/cython,scoder/cython,cython/cython,hhsprings/cython,larsmans/cython,rguillebert/CythonCTypesBackend,c-blake/cython,acrispin/cython,fperez/cython,ABcDexter/cython,bzzzz/cython,madjar/cython,hickford/cython,encukou/cython,dahebolangkuan/cython,hickford/cython,bzzzz/cython,JelleZijlstra/cython,acrispin/cython,marscher/cython,larsmans/cython,mcanthony/cython,slonik-az/cython,larsmans/cython,roxyboy/cython,hpfem/cython,hpfem/cython,cython/cython,roxyboy/cython,c-blake/cython,slonik-az/cython,c-blake/cython,ChristopherHogan/cython,mcanthony/cython,encukou/cython,rguillebert/CythonCTypesBackend,andreasvc/cython,acrispin/cython,dahebolangkuan/cython,slonik-az/cython,hickford/cython,fperez/cython,JelleZijlstra/cython,achernet/cython,achernet/cython,roxyboy/cython,hickford/cython,hpfem/cython,rguillebert/CythonCTypesBackend,mrGeen/cython,achernet/cython,mcanthony/cython,ABcDexter/cython,cython/cython,c-blake/cython,bzzzz/cython,fabianrost84/cython,encukou/cython,JelleZijlstra/cython,andreasvc/cython,fabianrost84/cython,mrGeen/cython,scoder/cython,acrispin/cython,achernet/cython,scoder/cython,rguillebert/CythonCTypesBackend,da-woods/cython,bzzzz/cython,da-woods/cython,scoder/cython,larsmans/cython,madjar/cython,mrGeen/cython,andreasvc/cython,encukou/cython,dahebolangkuan/cython,hickford/cython,hhsprings/cython,hpfem/cython,c-blake/cython,fabianrost84/cython,da-woods/cython,marscher/cython,fperez/cython,encukou/cython,da-woods/cython,JelleZijlstra/cython,marscher/cython,slonik-az/cython,ABcDexter/cython,fperez/cython,fabianrost84/cython,hhsprings/cython,roxyboy/cython,andreasvc/cython,slonik-az/cython,mrGeen/cython,mcanthony/cython,cython/cython,mrGeen/cython