- Fixed (common) issue when AI found neutral stacks infinitely strong
- Fixed non-fuzzy performance of some functions. Now AI really considers all options and uses multiple heroes, who don't spend their time wandering a lot.

git-svn-id: http://svn.code.sf.net/p/vcmi/code/trunk/@3736 4dfc6b2a-8b31-0410-aa91-d6c70e3ac834