LDEV-2114 * support for a whole new control flow * a lot of refactoring connected with this * changed structure of DTO objects * available to store multiple attempts * changed "Attempts allowed" default value to 1
LDEV-2105 * FCKEditor's new tag width set up * ajax submitting of fckeditors and contentFolderId variable fixed in option lists * new validation rule was introduced: One of the answers should have a grade of 100% * prevent throwing of errors while adding/removing options and units with wrong data * export lesson fixed * adding/removing of instruction files fixed