Code clean-up

This patch implements some idea by Alain Savard and Mike Whiteley taken from the perpertual renaming/reformatting thread.

This is a pure code cleaning patch (so no change in functionality), but I use it as a pretext to correct the bogus bench number that I introduced in the previous commit.

Bench: 4413383

src/evaluate.cpp

@@ -551,7 +551,6 @@ namespace {
                 score += ThreatByRank * (int)relative_rank(Them, s);
         }
 
-        // Bonus for king attacks on pawns or pieces which are not pawn-defended
         if (weak & attackedBy[Us][KING])
             score += ThreatByKing;
 
@@ -576,7 +575,7 @@ namespace {
     b  = shift<Up>(pos.pieces(Us, PAWN)) & ~pos.pieces();
     b |= shift<Up>(b & TRank3BB) & ~pos.pieces();
 
-    // Keep only the squares which are not completely unsafe
+    // Keep only the squares which are relatively safe
     b &= ~attackedBy[Them][PAWN]
         & (attackedBy[Us][ALL_PIECES] | ~attackedBy[Them][ALL_PIECES]);