some pt2to3 cleanup
some pt2to3 cleanup

joonro/PyTables,rabernat/PyTables,PyTables/PyTables,FrancescAlted/PyTables,gdementen/PyTables,mohamed-ali/PyTables,tp199911/PyTables,rabernat/PyTables,tp199911/PyTables,dotsdl/PyTables,andreabedini/PyTables,PyTables/PyTables,jennolsen84/PyTables,mohamed-ali/PyTables,tp199911/PyTables,rdhyee/PyTables,andreabedini/PyTables,jennolsen84/PyTables,rdhyee/PyTables,dotsdl/PyTables,joonro/PyTables,gdementen/PyTables,PyTables/PyTables,FrancescAlted/PyTables,jennolsen84/PyTables,mohamed-ali/PyTables,andreabedini/PyTables,jack-pappas/PyTables,mohamed-ali/PyTables,rdhyee/PyTables,jack-pappas/PyTables,joonro/PyTables,tp199911/PyTables,joonro/PyTables,rabernat/PyTables,jack-pappas/PyTables,FrancescAlted/PyTables,avalentino/PyTables,jennolsen84/PyTables,rabernat/PyTables,rdhyee/PyTables,andreabedini/PyTables,jack-pappas/PyTables,avalentino/PyTables,avalentino/PyTables,gdementen/PyTables,dotsdl/PyTables,dotsdl/PyTables,jack-pappas/PyTables,gdementen/PyTables