set func name for dependency errors so that using nwis.pytables w/out pytables installed doesn't give a confusing error
set func name for dependency errors so that using nwis.pytables w/out pytables
installed doesn't give a confusing error

cameronbracken/ulmo,ocefpaf/ulmo,nathanhilbert/ulmo,ocefpaf/ulmo,nathanhilbert/ulmo,cameronbracken/ulmo