Integrate JPlag plagiarism detection tool
Migrated from the repo of TMS v1.x (limited access)
TMS shall embed the JPlag plagiarism detection tool as an alternative to the currently used MOSS tool. MOSS and JPlag are the most widely used plagiarism detection tools, and their language set are not entirely overlapping, therefore the user (the instructor) shall be able to select which tool shall be utilized.
JPlag is written in Java and could be executed locally on the server, saving the results in an output directory. (Therefore persistence is easier compared to MOSS - see #43 (closed).)