dw/custom groups crossposting

Just to remind me...

From Dreamwidth memo:
The big improvement this week that people should notice: the crossposter
will now recognize custom friend groups on the remote site. Previously, if
you posted an entry filtered to a custom access group, it would post as a
private entry on the remote site; now, if you post to a custom access group
on Dreamwidth, it will post to the custom friend group on the remote site.
The two groups need to have exactly the same name for this to work; if the
names don't match exactly, the post will still default to private on the
remote site.