[fix] checked all boolean NOT's to see if they had to be binary NOTs. PlayerbotAI.cpp/h, PlayerbotAIClass.cpp/h, PlayerbotWarrior.cpp/h (nothing found), PlayerbotDruid.cpp/h (nothing found again, so didn't bother with other classes).

Signed-off-by: cala <calaftp@free.fr>
Fix for run-time NULL pointer crash, while bots are in combat

Signed-off-by: cala <calaftp@free.fr>
 Several fixes:

   o The bots were frequently inactive/delayed in combat and looting.
   o Bot with 'skinning' skill will now skin quicker.
   o Multi-node taxi flight has been fixed.

Signed-off-by: cala <calaftp@free.fr>
Improved method to control ranged/melee combat based upon spell range.

Fixes:
o Hunter bot check for ranged weapon ammo now fixed.
o Hunter spell 'auto shot' is now working as expected
o Fix all warnings

Signed-off-by: cala <calaftp@free.fr>