Deprecate mfunc mode + minor cleanups

git-svn-id: https://plugins.svn.wordpress.org/ad-injection/trunk@1035188 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fix description.

git-svn-id: https://plugins.svn.wordpress.org/ad-injection/trunk@1035190 b8457f37-d9ea-0310-8a92-e5e31aec5664