Bug 6331: remove obsolete column deleteditems.marc

Bug 6331: remove obsolete column deleteditems.marc

There is a difference between "items" and "deleteditems" tables
in "kohastructure.sql"
"deleteditems" has a field "marc" not existing in "items".

This patch removes this obsolete column.

Test :
- after deleting an item, check that the deleted item is properly
  stored in deleteditems table
- check that the column marc has been deleted from deleteditems table

Signed-off-by: Mathieu Saby <mathieu.saby@univ-rennes2.fr>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>