Defined methods 'comments' and 'hints' for questions and subparts ...

These methods are used to load germane comments for a question(mostly)  or
a subpart(perhaps in the future)  during grading.
Merge branch 'dev'
Load TexComments in descending order of the # of times its been used ...
Merge branch 'dev'
Merge remote-tracking branch 'upstream/master'