Remove superfluous whitespace.
i18n/L10n tweaks.

Add FIXME for missing class documentation.
i18n/L10n tweaks.
Superfluous whitespace removed.

Add dummy method MessageListItem::messageListItemDummyMessages() to allow xgettext to add possible sources to POT files.
Mark a few i18n issues as FIXME as well as some messages for which the use case was not clear to me.
Merged some code on multiple lines into one.
Translator documentation added.
Remove superfluous whiteapace.

Fix incorrect variable usage in messages.

Translator documentation updated.
Superfluous whitespace removed.
Some FIXMEs added.

i18n tweaks.
Add FIXME for missing class documentation.
Remove superfluous whitespace.

* qna:
  Some work towards allowing revisions
  Make new answers work
  More plumbing
  Work on QnA notice display -- in progress
  * Move stuff around again * Make answers save
  * Fix plugin filename * Make questions save!
  Renamed QuestionAndAnswerPlugin to QnAPlugin
  Most objects and forms are in place, now I just have to make it work.
  Skeleton / Stub for Question and Answers micro-app plugin

Provisional fix for ticket #3108: Facebook bridge sends "likes" as the notice's original poster instead of as the person doing the liking.

Adds optional $profile parameter for Facebookclient constructor and uses that for the foreign_link lookup if provided instead of the notice's poster.

Some other i18n and L10n updates, too.

i18n/L10n review not complete.

A bunch of the common_* functions for date formatting expect an interpretable string, rather than a Unix timestamp, as input. Switched to using the DB-formatted timestamps as we put them into the object rather than the unix timestamp intermediate value when formatting the plaintext and HTML fallback content.

Format timestamps as UTC in ActivityStreams output. While using local times is legit per spec, it's confusing to have it change around and confuses some clients that don't handle zones right.

Tweak which should fix ActivityStreams output for Twitter profiles (if remote_profile entries didn't match, we ended up losing id/URI).

Explicitly uses the Twitter profile URL as profile URI if matching, without having to check the db.

The ShowNoticeAction subclasses were cut-n-pasting a lot of prepare() code from ShowNoticeAction, though the only part that's different is how we look up the notice. Broke that out to a getNotice() method, so only that needs to be copied. Avoids extra copies of permission checks and other common code in this spot.