OBMFULL-5813 Removes the max_users domain property.

It appears to have never been enforced anyway.

Port of OBMFULL-3810 to next branch.
OBMFULL-4619 patch Mootools Autocompleter plugin to fix label autocomplete selection when creating an event
OBMFULL-4624 fix pdf printing. The legend was displayed on a single line, even if it was longer than the width of the pages. Now it is displayed on multiple lines
OBMFULL-4617 - Fix 'legend' block squashing feature in planning view