Changed location_set.of_pairs() to work with different formats of x,y coordinate tables.
Changed healer support mai to use new location_set.of_pairs() method to create avoid_map.
Merge pull request #11 from jleldridge/master

Rewrite location_set.of_pairs().
removing misplaced icon files
New artwork for status icons
New artwork for the editor palette: unit groups icons
UtBS Out of the Frying Pan: Use Messenger Escort Micro AI for messenger side

The scenario was still using an old version of the AI code.  Fixes the
error reported on the forum at
http://forums.wesnoth.org/viewtopic.php?t=38806
Also correct the goal hex for the messenger units, as they were heading
to the wrong location.
Micro and experimental AIs: turn off some debug output