LP1384796: Fix asset.copy_template valid_fine_level constraint

LP1384796: Fix asset.copy_template valid_fine_level constraint

The "valid_fine_level" constraint on the asset.copy_template has been
erroneously defined to check the load_duration column.  This commit
fixes it so that the constraint looks at the fine_level column as it
should.

This commit adds the database upgrade, a miscellaneous release note,
as well as the main schema change.

To test the patch, simply look at the asset.copy_template table in the
database before and after applying the database upgrade.  The
valid_fine_level constraint should reference the fine_level column
after the patch.

The code is based on a patch submitted by Tim Faile.

Signed-off-by: Jason Stephenson <jason@sigio.com>
Signed-off-by: Jane Sandberg <js7389@princeton.edu>
Signed-off-by: Galen Charlton <gmc@equinoxOLI.org>