Fix some asserts raised by is_ok()

There were two asserts.

The first was raised because is_ok() was called at the
beginning of do_castle_move() and this is wrong after
the last code reformatting because at that point the state
is already modified by the caller do_move().

The second, raised by debugIncrementalEval, was due to a
rounding error in compute_value() that occurs because
TempoValueEndgame was updated in an odd number by patch

"Merge Joona Kiiski evaluation tweaks" (3ed603cd) of 13/3/2009

This line in compute_value() is the guilty one:

result += (side_to_move() == WHITE)? TempoValue / 2 : -TempoValue / 2;

The fix is to increment TempoValueEndgame so to be even.

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

src/value.h

@@ -96,7 +96,7 @@ const Value PieceValueEndgame[17] = {
 /// Bonus for having the side to move (modified by Joona Kiiski)
 
 const Value TempoValueMidgame = Value(48);
-const Value TempoValueEndgame = Value(21);
+const Value TempoValueEndgame = Value(22);
 
 
 ////