Fixed a bug causing Ajax conflict testing not to work after a failed HTML5 form validation event
Updated Danish translation.  Thanks to Søren O`Neill
Fixed typo
Fixed bug when there's a conflict with an existing entry
Introduced a generate_submit() function.
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
Merged in latest changes from the trunk
Added client and server side validation to check that at least one room is selected.  (See SF Bugs #259)
Merged in latest changes from the trunk
Fixed undefined index bug causing other problems
Made the file a required field.
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
Merged in latest changes from the trunk
Added comments
Add script to link multiple bookings together into one booking, if the bookings differ only in the rooms they use.

This can be used to "upgrade" old bookings, so they use the new
linked_bookings feature.
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