Hourglass for AJAX Events

Added hourglass icon that automatically shows while AJAX events are
taking place such as loading data from the database or saving data to
the database via the web forms.
Merge fixes
Merge branch 'multiuser' of git://github.com/NeilCresswell/ChronoZoom into NeilCresswell-multiuser
Merge branch 'NeilCresswell-multiuser'