Minor tweaks to snf_engine.* to remove compiler warnings.
Refactored Evaluator objects to use unsigned ints for positions.

git-svn-id: https://svn.microneil.com/svn/SNFMulti/trunk@6 dc71a809-1921-45c4-985c-09c81d0142d9

git-svn-id: https://svn.microneil.com/svn/SNFMulti/trunk@4 dc71a809-1921-45c4-985c-09c81d0142d9

git-svn-id: https://svn.microneil.com/svn/SNFMulti/trunk@1 dc71a809-1921-45c4-985c-09c81d0142d9