Set the type of metas in TableTests to 'object'
Merge pull request #190 from janezd/test-table

Set the type of metas in TableTests to 'object'
Add test for data size to Domain.convert
Fix SQLRowInstance constructor
Allow Domain.conversion to accept meta values
Fix domain conversion for source values in meta attributes
Add unit tests for Instance.__init__, fix code
Add constant Unknown to Variable and derived classes
Fix Instance.__eq__
Add tests for Instance.__getitem__ and __setitem__
Add tests for Instance.__str__