Fix INSTALL.md having an extra -- for InitDb lines.
Don't apply Bandcamp URLCleanup to track/album URLs.

Also checks (validationRules) that track/album Bandcamp URLs are not
being used as artist/label URLs.

Follow-up to issue MBS-6998 / pull request #598.
Merge remote-tracking branch 'freso/MBS-6998-follow-up' into beta

* freso/MBS-6998-follow-up:
  Don't apply Bandcamp URLCleanup to track/album URLs.
Merge branch 'master' into beta