TinyMCE Relative URL prepending breaks some filters

TinyMCE prepends the base url on relative urls. This breaks some input filters. In my case, it breaks PathFilter.

http://wiki.moxiecode.com/index.php/TinyMCE:Configuration/relative_urls

I have created a patch that allows users to disable or enable this feature in the Admin menu.

With this patch, in admin/settings/tinymce/edit/[profile name], you now have a new option in Cleanup and Output to enable or disable TinyMCE converting relative URLs.