minor code style cleanup after recent merges

- add a missing license header
- correct some header orderings etc.

src/pubkey.cpp

@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2014 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
+// Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "pubkey.h"