WowAce

Hendrik Leppkes:
    - Properly use the terrain map offset for dungeon floors in Legion
    The API in legion changed to return the internal floor ids, which need
    to be offset by one when the map uses the terrain map as the first floor.
    - Re-use data tables for pins when an existing pin is re-added to move it.
    This avoids excess table creation which bypassed the internal table cache.
    - Protect against errors during loading when no unit position is available.
    - Fix handling of micro dungeons on transformed continents
    - Add feral druid artifact scenario override
    - Add instance override for the Karazhan Artifact Scenario
    - Dalaran Underbelly has its own instance ID, apparently.
    - Properly handle map levels in 7.0
    GetNumDungeonMapLevels() now returns a list of available map levels instead of
    a total count.
    - Add instance override for the Temple of Elune Scenario in Val'sharah
    - Add a fallback for GetNumDungeonMapLevels, which can return nil on the Legion Alpha.
    Minor intentionally not bumped since this change is only needed on the alpha,
    but would need a full data update to take effect, which would only add overhead on live.
    
    Reported by Gethe and MysticalOS on IRC, fix tested by MysticalOS.
    - Add the confirmed Draenor zone finale scenarios to the instance overrides
    - Add the proper Garrison Level 2 instance IDs
    Fixes ticket 5.