Html make target needs to be more robust

[renefritze]

Make errors get dumped in index.html We should probably move the xsltproc stuff to a seperate script that can deal with errors better than the current command sequence in cmake.

[abma]

already done:

cat /home/spring/bin/update-protocol.sh

!/bin/sh

cd /home/spring/www/wwwroot/dl/LobbyProtocol

git pull --quiet if ! make >error.log 2>&1 ; then mv error.log index.html fi