Checker: prevent file name collision
PlainTemplate: Sample test case table: column widths configurable
Added sample task "vim" from BOI 2013
Even unit test submissions get their usual score

Calculating the score depending on the fulfillment of unit test
assumptions is confusing.
No, GerLoader is not for loading contests in the Italian format...
SubtaskGroup: Don't crash when compilation failed
Be nicer to None
Generate detailed feedback subtasks in the end
Rename detailed to feedback
No tokens by default
sample.build -> sample/build