Adding menu item for searching musicbrainz by catalog number, but I wasn't able to test it to work. The catalog search doesn't seem to work on musicbrainz.org either.
Based on examples, we might needs these mutex calls. Still not solving the problem with the second dialog.
Send the cursor back to the release that was selected if it is included in the new filter.
Bug fix: should not try to use iter if the search failed.
More useful formatting of release, but this breaks the filtering code.
Switching the format filtering code to using the new 'sortformat' column. Adding Unknown type to list of releases in menu (quick fix).
Housekeeping
Bug fix: updating recording (track) code to use new db schema (should also be faster than before).