Fixed warnings/errors from require_once() calls in session_cookie.inc.
Fixed bug causing time selectors not to work properly after the area has been changed.   See SF bugs #258
Fixed bug where no room was selected on changing area.  See SF bugs #259
Added client and server side validation to check that at least one room is selected.  (See SF Bugs #259)
Disabled Ajax conflict checking and day/week/month page refresh when the page is not visible (subject to browser support of page visibility)
Fixed bug in last commit
Added comments
Fixed bug whereby the repeat entry row is not deleted if you do a bulk delete from the Report page of all the entries in a series (see SF bugs #260)
Tweaked formatting
Updated Italian translation.  Provided by Diego Zuccato
Fixed bug introduced in Rev 2671 preventing resizing of bookings in the week view.   See SF bugs #262
Fixed bug causing clicking outside the datepicker to result in date selection, rather than cancelling the datepicker.   See SF Bugs #263
Disabled page refreshing while resizing is in progress
Fixed bug causing interval timer to stop occasionally
Fixed a bug causing multiple timers to be fired when the page is hidden and then unhidden
Prevented page refresh when the mouse is hovering over a resize handler (ie the user is about to start a resize)
Restructured code
Improved performance of drag selection, especially with large tables
Made sure that page refresh isn't restarted while we are in the middle of a drag selection when we pass over the handles for resizable bookings
Fixed bug causing incorrect checking of resolution and number of slots when the booking day stretches past midnight.