Features:
* Logs for jPlag parser (`plagiarism-report/parser.log`)
* Shows errors when a submission includes invalid files
Other changes:
* `plagiarism-report` folder moved to the according `exercise` folder for easier access
* `plagiarism`-command now takes same location parameters as the other commands
* `choose-feedback`-command now also allows saving the feedback count to csv after selection
* `mail` command no longer saves feedback count