Endless crusade against AI issues and loopholes!
- Fixed #1126
- ClearWayTo and GatherArmy goals will also consider multiple subgoals
- GatherArmy may include building dwellings in town (experimental)

git-svn-id: http://svn.code.sf.net/p/vcmi/code/trunk/@3673 4dfc6b2a-8b31-0410-aa91-d6c70e3ac834