Fixed GcalEventOverlay handling of dates.
Added initial code and methods to handle adding events to GcalManager.
Fixed in GcalMonthView handling of dates passed to event-creation.
Fixed gcal-utils sources for gcc warning.
Fixed calling order in GcalWindow.
Since 3.5.3, evolution-data-server has changed API regarding
storage and retrieval of sources, introducing the ESourceRegistry
and removing GConf.
Adapt to that.
Added a method for sending a fake signal to newly created that don't cause an
update of the timespan covered by the actual query of GcalManager.
Added get_event_all_day method for find out if and event is all-day.
Fixed some minors align issues
Added method to GcalManager to get dtstart from events
Added method to GcalManager to sync COLUMN_ACTIVE with GcalManagerUnit::enabled
attribute
Added method for receiving button press events of view in GcalWindow