Also, the unselect rule for DELETE was useless anyway since it would
already have been filtered out by not having true.
(the => false stuff are for when you want ALL _except_ that)
Since we store 'favorite' verbs as notices now too, they caused a lot of
"null" notices that might not be interesting before we handle them better
in the UIs.
There were some differences between defaults for the
NoticeStream::getNoticeIds() function and some of its subclasses'
implementations. So, I got them rationalized.
We've been muddling through with 6- or 8-argument functions for managing streams. I'd
like to start thinking of streams as their own thing, and give them some more value.
So, the new NoticeStream class takes over the Notice::stream() function and Notice::getStreamByIds().
There's probably some fine-tuning to do on the object interface.
