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Conflicts:
	plugins/Facebook/facebookaction.php
	plugins/Facebook/facebookhome.php
	plugins/Facebook/facebookutil.php

The ShowmessageAction was using the MailboxAction to do its display of
a single direct message. Since we redid the nickname management, this
was breaking (MailboxAction requires a nickname argument,
ShowmessageAction does not, and nickname validation that used to
quietly fail now throws an exception).

I've moved the message list processing to its own widget class, so the
need to subclass MailboxAction has disappeared. I've rewritten this
action to use the MessageListItem widget, and it works fine now.

Our mailbox actions (inbox and outbox) were doing their own display of
messages. This was causing issues with especially showmessage, which
since the more rigourous nickname checks were added, no longer works as
a mailbox subclass.

I've taken the time to rip out the message listing code from MailboxAction
and moved it to a MessageList widget. The different mailboxes now have their
own subclasses that show the correct profile in the list.

Issue #3025: string -> boolean for profile_background_tile entry in JSON user results from Twitter-compat API

This entry was using the strings 'true' and 'false' instead of literal booleans, which could confuse clients expecting literal booleans as in other places and on Twitter in this place.

Add a brief explanation of what group inbox is at the top of the page (instructions section), plus a message to show when there are no private messages in the inbox.

Fix group regexes that got missed in Nickname::DISPLAY_FMT update: fixes bug where group linking happened, but not actual delivery, when using _underscores_ in the !group_name

Shows the messages to a private group in a list. New classes for
showing a group private message and list of group private messages.

New actions for showing a stream of group private messages and a
single group private message.

Conflicts:
	lib/groupeditform.php