Bug 14199: Database revision for marc21_orgcode.pl

Bug 14199: Database revision for marc21_orgcode.pl

This patch adds the dbrev in atomicupdate, updating the marc structure
for existing installations. (New installation in previous patch.)
And it removes the obsolete plugin files.

Test plan:
Run upgrade. Verify that new plugin is linked (for bib and auth).
Check plugin in editor.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Plugin tested, added to 040a/c/d
Test pass
No koha-qa errors

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>