OO-1608: check the file size before saving, make the cancel button a real cancel, change to handle gracefully maxPostSize of Tomcat

OO-1606: close asap the database connection in the QTIPreWarm executor, remove some unused spring dependencies as Eclipse Mars detect them

OO-1604: fix the red screen, fix the stupid warning, wording for the editors, create the tasklist object by import and copy of courses

OO-1599: fix a red screen if the task assignment step is enabled after someone started the process without it, add a confirm in the editor