MBS-3856: Revert MBS-1052 "Amazon should lookup cover art by barcode too"

This partly reverts 609f1cb and ea96414.
MBS-3856: Add ./admin/RemoveBarcodeCoverArtUrls.pl.

This script removes all cover art URLs from releases that were fetched
using barcode.
MBS-5663: validDate should handle leap years
MBS-3856: Fix ./admin/RemoveBarcodeCoverArtUrls.pl (fixup 9737724).
MBS-3856: Also clean releases where barcode has been removed (fixup 9737724).
Add release-country predicate to edit search
MBS-5577: Relationship Editor displays "vocal vocals"
MBS-5288, normalize pages xml response in Data::WikiDocIndex::get_wiki_versions.
MBS-5288, use ForceArray when calling XMLin instead of normalizing the result later on.
Update CDStub::Browse test for the new year.
Merge branch 'release-country-edit-search' into beta

* release-country-edit-search:
  Add release-country predicate to edit search
Merge branch 'master' into beta
Merge branch 'mbs-5288' into beta

* mbs-5288:
  MBS-5288, use ForceArray when calling XMLin instead of normalizing the result later on.
  MBS-5288, normalize pages xml response in Data::WikiDocIndex::get_wiki_versions.
Merge remote-tracking branch 'bitmap/mbs-5663' into beta

* bitmap/mbs-5663:
  MBS-5663: validDate should handle leap years
Merge remote-tracking branch 'origin/mbs-3856-revert-barcode-search' into beta

* origin/mbs-3856-revert-barcode-search:
  MBS-3856: Also clean releases where barcode has been removed (fixup 9737724).
  MBS-3856: Fix ./admin/RemoveBarcodeCoverArtUrls.pl (fixup 9737724).
  MBS-3856: Add ./admin/RemoveBarcodeCoverArtUrls.pl.
  MBS-3856: Revert MBS-1052 "Amazon should lookup cover art by barcode too"
Merge remote-tracking branch 'bitmap/mbs-5577' into beta

* bitmap/mbs-5577:
  MBS-5577: Relationship Editor displays "vocal vocals"
Merge remote branch 'metabrainz/beta' into other-127-sponsor-page

* metabrainz/beta:
  Update CDStub::Browse test for the new year.
  MBS-5288, use ForceArray when calling XMLin instead of normalizing the result later on.
  MBS-5288, normalize pages xml response in Data::WikiDocIndex::get_wiki_versions.
  MBS-5577: Relationship Editor displays "vocal vocals"
  Add release-country predicate to edit search
  MBS-3856: Also clean releases where barcode has been removed (fixup 9737724).
  MBS-3856: Fix ./admin/RemoveBarcodeCoverArtUrls.pl (fixup 9737724).
  MBS-5663: validDate should handle leap years
  MBS-3856: Add ./admin/RemoveBarcodeCoverArtUrls.pl.
  MBS-3856: Revert MBS-1052 "Amazon should lookup cover art by barcode too"