TEST_MAXFILESIZE should or could be usable together with USESAFEDOCKER

[ifrh]

In README.md it is mentioned:

The maximum size of a file produced by a user submission (setting TEST_MAXFILESIZE, currently not supported with USESAFEDOCKER, until http://stackoverflow.com/questions/25789425 is resolved)

In http://stackoverflow.com/questions/25789425, which has been posted in Nov 2014, there exists an answer from the year 2015 points to a Docker Issue which has been closed as implemented for using ulimits. ( cf. KITPraktomatTeam/Praktomat#358 )

[hannesbraun]

This should be already implemented:

praktomat/src/utilities/safeexec.py

Lines 92 to 93 in ae042a3

	if fileseeklimit:
	command += ["--ulimit", "fsize=%d" % fileseeklimitbytes]

Granted, I forgot to update the README... which is fixed now as well: 19c2c6f