* extensions/module_groups, extensions/module_groups/icon_menu.png,
extensions/module_groups.php: add extension to show table of modules where
the columns is the modules group and the rows is the agents group. And
this extension use as example in wiki openideas.
git-svn-id: https://svn.code.sf.net/p/pandora/code/trunk@1890 c3f86ba8-e40f-0410-aaad-9ba5e7f4b01f
mdtrooper