[TYPO3-core] RFC #11684: Add support for flash messages in the backend

[Ingo Renner]

Hi all,


Attached is v3 of the patch with only minor changes to how the messages 
are rendered (compared to v1).

As agreed with Francois we will
* introduce "types" of messages with a separate RFC
* add an icon for notice messages if a good one can be found (probably 
as an FYI after talking to the HCI team)
* have developers care for htmlspecialchars() on their own so that we 
can have things like links and lists in the messages


all the best
Ingo

-- 
Ingo Renner
TYPO3 Core Developer, Release Manager TYPO3 4.2