Comment formatting

[hmontero1205]

When deducting a comment, also annotate the numeric point deduction so that students don't have to cross-reference rubric just to double-check arithmetic.

e.g. instead of just

(C3)
have it dump

(C3: -4)
and then have a different syntax for no point deduction, e.g.:

[A3: 0]

[ transferred from cs4118/pygrader, opened by @j-hui ]