[api] fix incorrect diffing on creation of submit requests with given target
[webui] Small fixes in the OBS specific markup

 * @user was not working at the very beginning of the comment.
 * Req# and SR# are now case insensitive (and Request# added)
[webui] catch some more exceptions to avoid 500 crashes in request handling
[api] handle diffing of new request to project linked targets correctly
[webui] avoid hanging live log page, when the worker allows TCP connect, but does not deliver data
[dist] Don't redirect to /dev/null

We surely want it to tell us if these don't succeed (because e.g. your
tar file has the wrong name).