Add a PyTables wrapper.
Flesh out the Mapping interface for H5Attrs
Add more tests for overwriting nodes
Make open_h5file available to code outside of the tests.
delete_existing now also applies to groups
Merge branch 'feature/h5-package' of github.com:enthought/apptools into feature/h5-package
Fix baby indentation error in open_h5file
Merge pull request #19 from enthought/feature/h5-package

A PyTables wrapper