Multily fileseeklimit by 1024 to get units right
Merge branch 'master' of i44sun3:praktomat
Fix last commit (broke tests)
Enable default TEST_MAXFILESIZE in devel and test settings
1014 < 1024...
Remove src/checker/scripts/execute altogether

It was only setting the max filesize ulimit, and this has already been done by
the python code.
Register files uploaded via zipfiles in env.sources as well
Raise soft limits for virtual memory and number of threads for javac