OO-1615: springuifie mail package, rest package, question pool module... remove unused dependencies...

OO-1611: update pdfbox, springframework, hibernate, apache poi... exclude jgroups, bootstrap framework from .war

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