OO-2870: allow negative score for "choice" interactions like single and multiple choices, hotspot, hottext and match (drag and drop or not)

OO-3067: Handle exception if a course reminder rule is invalid and add some validations in GUI to avoid invalid reminder rules

OO-3058: disable the optimistic locking by efficiency statement and replace with last commit win (in all case, the last which compute it win, locking or not)

OO-3037: remove null in a first loop and sync in a second loop, add unit test which simulate the case

OO-3032: make the configuration of MathJax configurable and modify initialization script (patch D. Haag)

OO-3021: open a new paragraph for DIV and for QTI 2.1 trim the text buffer before P and DIV to remove special blank characters

OO-3019: import QTI 2.1 assessment test as QtiWorks one and mark them as QtiWorks in the test and sel test course elements

OO-3019: import QTI 2.1 assessment test as QtWorks one in self test course element like in test element

OO-3007: reverse the match method for the numerical input in statistics and archive to match the XML of the assessment items

OO-2997: don't set margin of image with size like 28x30 (default by IE), give a real name to images...