Fixed detection of vlstr attributes (close gh-164)
Fixed detection of vlstr attributes (close gh-164)

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