Cleanup code using forward declarations.

Use misc methods of avoiding unnecesary header includes.
Replace int typedefs with int##_t from stdint.h.
Replace PRI64[xdu] with PRI[xdu]64 from inttypes.h.
Normalize QT_VERSION ifs where possible.
Resolve some indirect dependencies as direct ones.
Remove extern declarations from .cpp files.

src/test/canonical_tests.cpp

@@ -1,16 +1,19 @@
 //
 // Unit tests for canonical signatures
+//
+
 
-#include "json/json_spirit_writer_template.h"
-#include <boost/test/unit_test.hpp>
-#include <openssl/ecdsa.h>
 
-#include "key.h"
 #include "script.h"
 #include "util.h"
 #include "data/sig_noncanonical.json.h"
 #include "data/sig_canonical.json.h"
 
+#include <boost/foreach.hpp>
+#include <boost/test/unit_test.hpp>
+#include "json/json_spirit_writer_template.h"
+#include <openssl/ecdsa.h>
+
 using namespace std;
 using namespace json_spirit;