remove test.php as api-cli.sh should be used now

Signed-off-by: Michael Kaufmann (d00p) <d00p@froxlor.org>
added Groups::addGroupsToUser() and Permissions::addPermissionsToGroup(); hide password/apikey of users in Groups::statusGroup(); fix overwriting of api-version in Froxlor::getInstance()

Signed-off-by: Michael Kaufmann (d00p) <d00p@froxlor.org>