Applied Christof's patch in rev 6276:177b186dd23a.

Closing.

Cédric you will have to keep applying your patch and revert the
patch to the template in future releases.

Getting support for markdown config options and support for 
"githubMarkdownNewline" or some such option for the markdown backends 
will remove he need for your local patches. (Note Mistune can support 
this via a new plugin to be written by somebody.)

Alternatively you can bulk edit the affected message files replacing
the trailing newline with with two spaces followed by a newline.
So they are using the standard markdown format for embedded linebreak

That's one of the advantages of storing the message files in the 
filesystem. Some roundup-admin fu to select the markdown format
messages and a little sed/perl should get you fixed up if you want
to go this way.

-- rouilj