evol : add management of docservers objects in core

core/trunk/core/class/docserver_locations.php

core/trunk/core/class/docserver_locations_controler.php

core/trunk/core/class/docserver_types.php

core/trunk/core/class/docserver_types_controler.php

core/trunk/core/class/docservers.php

core/trunk/core/class/docservers_controler.php

core/trunk/core/core_tables.php