New TODO comment style.

Qt Creator 2.5 is able to parse those.

src/crypto/CryptoHash.cpp

@@ -48,7 +48,7 @@ CryptoHash::CryptoHash(CryptoHash::Algorithm algo)
     }
 
     gcry_error_t error = gcry_md_open(&d->ctx, algoGcrypt, 0);
-    Q_ASSERT(error == 0); // TODO error handling
+    Q_ASSERT(error == 0); // TODO: error handling
 
     d->hashLen = gcry_md_get_algo_dlen(algoGcrypt);
 }