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Bookmark plugin: graceful error out for failure to import a delicious bookmark due to it being already bookmarked

I was trying to generate URIs for Bookmarks based on (profile, crc32(url), created).

I failed at that. CRC32s are unsigned ints, and our schema code didn't like that.

On top of that, my code to encode and restore created timestamps was problematic.

So, I switched back to using a meaningless unique ID for Bookmarks.

One way to do this would be to use an auto-incrementing integer ID. However, we've been
kind of crabbed out a few times for exposing auto-incrementing integer IDs as URIs, so
I thought maybe using a random UUID would be a better way to do it.

So, this patch sets random UUIDs for URIs of bookmarks.

Version 0.9.6 and below of StatusNet assume anything in <author> is a
Person. So, we include an <activity:subject> element, which will be
checked first by those versions of the code, only for group feeds.

At some point we'll take this out, but it's useful for now.

* adds Right::CREATEGROUP
* logic in Profile::hasRight() checks for silencing
* NewgroupAction checks for the permission before letting you see or process the form in the UI
* User_group::register() logic does a low-level check on the specified initial group admin, and rejects creation if that user doesn't have the right; guaranteeing that API methods etc will also have this restriction applied sensibly.