Update for the page Administration > Mail obsolete project

• The "size" filter criteria has been replaced by a "space" filter.
• The default value is "no filter".
• The result table has one more column, "Project space".
• The search algorithm has been updated.

WARNING : Check the issue #151 (closed) to find the SQL commands to update the views's structures. Do not forget when pushing the next verion of nG6!