minor license, header end comment etc. cleanup in /script

- ensure all licenses are just MIT
- add a missing header end comment
- ensure alphabetical ordering

src/script/sigcache.h

@@ -1,6 +1,6 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2013 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
+// Copyright (c) 2009-2014 The Bitcoin developers
+// Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #ifndef H_BITCOIN_SCRIPT_SIGCACHE
@@ -23,4 +23,4 @@ public:
     bool VerifySignature(const std::vector<unsigned char>& vchSig, const CPubKey& vchPubKey, const uint256& sighash) const;
 };
 
-#endif
+#endif // H_BITCOIN_SCRIPT_SIGCACHE