- Changed aggregation method so now fuzzy engine takes all the factors into consideration
- Heroes now will use real path cost and their movement, which has numerous advantages:
* Actual movement cost is taken into consideration
* Groups of heroes will keep order
* Fastest heroes will be used for exploration first

git-svn-id: http://svn.code.sf.net/p/vcmi/code/trunk/@3739 4dfc6b2a-8b31-0410-aa91-d6c70e3ac834