* r4
o Different checking strategy with delayed checking, should improve performance
under heavy load, but comes at the price of (insignificantly) higher idle-load
o Nasty OnUpdate hack for mouse tooltip to work around limitations of
UPDATE_MOUSEOVER_UNIT, mouse tooltips should now hide when no mouseover unit
exists
* r3
o More sanity checking
o More debug output
* r2
o Added pet support
o MouseOver bug fixes and refactoring