OO-1068 OO-1067 flexi form refactoring towards bootstrap, implement default layouts, further simplify DOM

OO-937: english wording, fix issue with checklist where passed is calculated from the number of checkbox

OO-1049 grand admin/moderator rights also to co authors for open meeting course elements (patch from Stephan Clemenz)

OO-984: add media mapper for description, objectives, credits, requirements, refactor long to int conversion in quota, remove some used parameters for the rich text element

no-jira: backport fix for the escaping of already escaped characters by TinyMCE in enrollment course element

OO-1038: better check of long without exception, try and catch in PersistingCourseGroupManager, unit tests

-no-jira: replace escaping with antisamy for group description as the description is edited with TinyMCE (which already escape special characters)

OO-716: replace the flot library in the course statistics with the bar chart component which use d3.js