Print command lines in a way that preserves spaces and arguments structure.

Also ease debug by printing the failed command line when creating a Sandbox.
Fixed many pep8 warnings.
Fix cmsMake after the addition of new languages
Make RS smart: don't require the process_cmdline
Fix OutputOnly failing submissions compilation

Job.plus was accessed by ES (when calling Job.to_submission_compilation
inside EvaluationService.action_finished), therefore raising an
exception (which was silently dropped).
Fix small Javascript bugs
Format (compilation and evaluation) status texts in AWS

The compilation text should be augmented with stdout, stderr, time and
memory consumption, etc.
Added PHP support.
Updating docs to include configurable languages.
Moved cmscommon.DateTime to cmscommon.datetime.
Merge remote-tracking branch 'upstream/master' into ger-taskformat