fixed critical errors related to survey subclassing and renaming of deadline and opening properties, and surveys in sidebar are now marked as such and have a red color if untaken
Coverage: code coverage testing for Python
Coverage.py is a Python module that measures code coverage during test execution.
It uses the code analysis tools and tracing hooks provided in the Python standard
library to determine which lines are executable, and which have been executed.
For more information, see http://nedbatchelder.com/code/modules/coverage.html