fixed EDU-263 Python 3.2 interpreter cause wrong answer been accepted (because of exception in import)
(cherry picked from commit c88b41b)
fixed EDU-263 for new courses
(cherry picked from commit 62ea097)
Merge remote-tracking branch 'origin/139' into 139
EA-59566

(cherry picked from commit 377a31f859738da0da61246ad411cfe3c9227061)
IDEA-125016 Commenting out a line in an XML file with commented out comments lower in the file can cause unwanted changes (and invalid xml). REGRESSION
(cherry picked from commit 5537892)