add missing header end comments

- ensures a consistent usage in header files
- also add a blank line after the copyright header where missing
- also remove orphan new-lines at the end of some files

src/script.h

@@ -833,4 +833,4 @@ bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const C
 // combine them intelligently and return the result.
 CScript CombineSignatures(CScript scriptPubKey, const CTransaction& txTo, unsigned int nIn, const CScript& scriptSig1, const CScript& scriptSig2);
 
-#endif
+#endif // H_BITCOIN_SCRIPT