OO-696: update to tinymce vers. 4 but let vers. 3 functional, rewrite the olat plugins for tinymce 4 new ui

OO-684 fix left alignment in trees with root, add marker css to tree, more general defaults in definitions

OO-533 UI tune the pool admin area, adding i18n intro help texts, new css classes to make master-detail view with menu panels

OO-682,OO-531: remove sound for new message on IE as it create an error or show a big play button which results that we cannot open the instant message window

OO-533 various layout improvements question pool, streamlined highlight color in table, calendar and buttons

OO-623,OPENOLAT-128: prevent batch merge, configure, remove... in the groups lists if an item is managed, show a warning if it's the case, add some warnings too if there isn't no selected group for a batch operation

OO-658: fix an CSS issue where the open/close link is hidden by the select link, enable to close menu item in the admin tab

CL-220: light refactoring of the mail inbox/outbox for Oracle with a light version of the DBMail object without the body of the mail, optimize some queries to prevent loading of security groups with a subquery