Move relevant np_utils fucns to operations.py to support no ndarray
Make hstack work without structured arrays
Make vstack work without structured arrays
Remove get_groups() from operations
Make join work without structured arrays
Update CHANGES.rst
Deprecate public functions in np_utils
Add message for deprecated np_utils functions [skip ci]
Merge pull request #3179 from taldcroft/table-ops

Remove use of numpy structured arrays in table operations