loading all filters with a wild card crashes impolitely

[moustakas]

This works fine

decam = filters.load_filters('decam2014-*')

but this causes doom and destruction:

decam = filters.load_filters('decam2014*')
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-76-017fef935f54> in <module>()
----> 1 decam = filters.load_filters('decam2014*')

/usr/local/lib/python2.7/site-packages/speclite-0.4.dev338-py2.7.egg/speclite/filters.pyc in load_filters(*names)
   1504     responses = []
   1505     for name in names_to_load:
-> 1506         responses.append(load_filter(name))
   1507     return FilterSequence(responses)
   1508 

/usr/local/lib/python2.7/site-packages/speclite-0.4.dev338-py2.7.egg/speclite/filters.pyc in load_filter(name, load_from_cache, verbose)
   1571             'data/filters/{0}.ecsv'.format(name))
   1572     if not os.path.isfile(file_name):
-> 1573         raise ValueError('No such filter file "{0}".'.format(file_name))
   1574     if verbose:
   1575         print('Loading filter response from "{0}".'.format(file_name))

ValueError: No such filter file "/usr/local/lib/python2.7/site-packages/speclite-0.4.dev338-py2.7.egg/speclite/data/filters/decam2014*.ecsv".

[dkirkby]

The error message could certainly be improved here, or do you think passing a bad string should not raise a ValueError at all?

[dkirkby]

This case is now unit-tested and raises a ValueError with the more helpful message:

ValueError: Invalid wildcard pattern 'decam2014*'. Use '<group>-*'.

I also added a few other new error messages to handle common problems:

ValueError: No such group 'sdss'.  Choose one of ['sdss2010', 'decam2014', 'wise2010', 'bessell'].
ValueError: Invalid filter name 'nosuch'. Use '<group>-<band>'.
ValueError: No such filter 'sdss2010-y' in this group.

I just committed the changes to the master branch.

[moustakas]

This look good to me; feel free to close.