Bugfix: now Data.append() works even when column names unindexable.
Bugfix: now Data.append() works even when column names unindexable.

PyTables won't index columns that include spaces, start with numbers or
_, or include - . The append method now will index all columns when it
can, but will still work (without indexing the columns) when it can't.

datreant/datreant.data,datreant/datreant,datreant/datreant,andreabedini/datreant,dotsdl/datreant,datreant/datreant.core,datreant/datreant.core