Fix 'generation' type to uint8_t

When we store this value in TT we cut this to 9 bits,
so we need a smaller variable otherwise comparisons
like:

   replace->generation() == generation

Are always false if generation is bigger then the maximum
TT storable value.

This fixes a very nasty and difficult to spot bug (2 weeks for
regression hunting).

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

src/movepick.h

@@ -64,7 +64,7 @@ private:
   Bitboard pinned;
   MoveStack ttMoves[2], killers[2];
   int badCaptureThreshold, phase;
-  const int* phasePtr;
+  const uint8_t* phasePtr;
   MoveStack *curMove, *lastMove, *lastGoodNonCapture, *badCaptures;
   MoveStack moves[MOVES_MAX];
 };