* include/functions_gis.php: add function "deleteMap" for to delete the map
and other rows in tables related.
* godmode/gis_maps/index.php: use the "deleteMap" in link of delete map.
* include/functions_db.php: add function "clean_cache" for clean the
problematic (sometimes) cache.
git-svn-id: https://svn.code.sf.net/p/pandora/code/trunk@2317 c3f86ba8-e40f-0410-aaad-9ba5e7f4b01f