ENH: add filter for list_catalogs

[bsipocz]

Very often one ends up doing a list comprehension to similar to filter out a particular mission from the list of catalogs. Would be nice to have this as a built in functionality.

E.g.:

>>> from astroquery.ipac.irsa import Irsa
>>> Irsa.list_catalogs(filter_name='higal')
{'higal70': 'Hi-GAL 70 micron Photometric Catalog',
 'higal160': 'Hi-GAL 160 micron Photometric Catalog',
 'higal250': 'Hi-GAL 250 micron Photometric Catalog',
 'higal350': 'Hi-GAL 350 micron Photometric Catalog',
 'higal500': 'Hi-GAL 500 micron Photometric Catalog',
 'higal360clump': 'Hi-GAL 360 degree Catalogue of Clump Physical Properties'}

As opposed to deal with a 900+ long list of catalogs

[keflavich]

I like the idea! Perhaps we should have both filter_key and filter_description options (and filter_either?) so that you can filter down based on either the keyword or the description

[bsipocz]

I would think we could do key:value pairs? There are all these columns:

['table_index',
 'schema_name',
 'table_name',
 'description',
 'table_type',
 'utype',
 'irsa_dbms',
 'irsa_pos',
 'irsa_sptlevel',
 'irsa_missionid',
 'irsa_groupid',
 'irsa_access_flag',
 'irsa_nrows',
 'irsa_odbc_datasource',
 'irsa_spatial_idx_name']

However I agree that in practice it's table_name or description that most users would want to filter on.