MBS-4962: set aggressive expires headers for 10 after the hour on requests to slave servers that won't update more frequently
MBS-4962: set Last-Modified too
MBS-6179: don't include null catalog numbers in the sort key when sorting by catalog number
MBS-6270, add track identifier redirect and rdfa attributes.
MBS-6263: don't show blank values in Create Area edits
MBS-6264, MBS-6300, MBS-6301: link areas in relevant statistics, and show last_updated dates properly
MBS-6270, use URI object to add fragment identifier in Controller::Track.

(also other small cleanups to that file, based on pull request feedback).
MBS-6270, add Data::Release->find_gid_for_track test.
MBS-6270, Add Controller::Track test.
MBS-6297: Enable more editing links in area sidebar

All editors are able to perform some operations on area's - viewing annotation
history and creating non area-area or area-url relationships. This commit
loosens the conditions for showing of these links so that they are shown to all
editors, not just location editors.
MBS-6325: Perform 'set_release_group_first_release_date' on release moves

When a release's release_group attribute changes, we perform
set_release_group_first_release_date to update the first release date of both
the new release group and the old release group.

Also includes a fix up script to set fix all current anomalies.
MBS-6264, MBS-6300, MBS-6301: Update Controller::Statistics tests to test for last-updated and area links, plus consolidate
Merge branch 'master' into mbs-6179

Conflicts:
	lib/MusicBrainz/Server/Data/Release.pm
MBS-6179: basic back to functioning for collection sorting
MBS-6179: fix up my faulty miscopy
remove  entirely
Improve and display area stats
Remove duplication of knockout.js include between relationship-editor and knockout manifests.
MBS-6409: don't translate ModBot edit note for URLs already having been merged
MBS-6377, ReleaseDisc.tracklist should contain the data loaded from the medium, without the release artist edited.