V4.1

initial merge of the notice plugin (also called announcements).  There are still a few things missing here, but mostly related to missing fixture data I believe (notice_conf table is empty and seems to want some values there in inital load of the plugin).  Also looks as if there needs to be some default categories which are also missing.  But please review for me as this merge was a little tricky and I want to make sure it looks ok so far.