Merge pull request #158 from idynin/master

Halving mouse rx and ry just once improves performance
Merge pull request #159 from idynin/master

Fix MMouse error
Fixes RadialWalk and friends.

Fixes RadialWalkEx to enable search in the counterclockwise direction,
like is described in picture 1 in this post:
http://villavu.com/forum/showthread.php?t=372&p=3370#post3370

Does this by bypassing the FixD inside of variantToDirection, as
negative degrees are already fixed in FilterPointsPie.

This commit also fixes the ability to pass compass directions to RadialWalkEx,
ex. 'n', 's', etc.

Signed-off-by: idynin <ilya@idynin.com>