Add columns:

  Events.lastSynced: flag marking this as a duplicate of the lastSynced sate of the event
  Events.sync_data7: General purpose sync column (will be used for editUrl in Google Sync Adapter)
  Calendars.canPartiallyUpdate: Flag indicating sync adapter can perform partial updates.

Change-Id: I5c153fb9cbf43dd1def0267c2f912a59038b28c1