fixed missing 'clear bookmarks' menu option on map bookmarks screen
fixed bug where map items were not geting displayed when launched from event sor tours

list building numbers instead of names when browsing by building number

automatically display a callout if there is only one map item with an callout defined and showCallout is set to true
heavily refactored, so both views of the schedule, standard view and comparison view
can easily ask the DiningMealIterator for any data it needs.
Merge branch '2.4-dev' into 2.4/feature/dining