added player_id_t typedef and INVALID_PLAYER, use that instead of -1.
also added sanity checks to cpu.cpp to ensure ARCH_* is correct (see
http://www.wildfiregames.com/forum/index.php?showtopic=13327&hl=)
and further predefined macros to arch.h just to be sure.
This was SVN commit r8079.
Remove redundant comparisons in pathfinder.
Simplify range query result ordering.
Avoid throwing exception on script errors in debug serializer.
This was SVN commit r7828.
