Finishes adding popup help to siteprefs
Removes the options for caching UDT's (always false)
or caching module plugins (defaults to false, but the module can decide).


git-svn-id: http://svn.cmsmadesimple.org/svn/cmsmadesimple@8805 3d254a34-79dc-0310-9e5f-be208747d8a0