FYI: Multisite, PublishXP, External Imageblock changes

Today I committed some big changes.. here is some information to help keep your site functioning and up to date:

1) There is a brand new multisite system.. this is now compatible with both url rewrite module and embedded G2. If you have a setup using the old multisite system the upgrader will block you from proceeding and direct you to README.html where you will find instructions for updating to the new system (manual steps are required, sorry).

2) The naming convention for views/controllers has changed to use "." as a separator instead of ":".. now that we urlencode all parameters this makes urls look a little nicer (otherwise we'd have %3A all over the place). This should only affect you in a couple cases: if you use external imageblock you should update your urls to use imageblock.External. If you use publishxp module you should update your registry. If you use rewrite module you should have it resave your .htaccess file. Note that we still support the old style view names for now, but it is a good idea to update these things.