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/test_bitcoin.cpp

@@ -1,12 +1,17 @@
 #define BOOST_TEST_MODULE Bitcoin Test Suite
-#include <boost/test/unit_test.hpp>
-#include <boost/filesystem.hpp>
+
+
 
 #include "db.h"
-#include "txdb.h"
 #include "main.h"
-#include "wallet.h"
+#include "txdb.h"
+#include "ui_interface.h"
 #include "util.h"
+#include "wallet.h"
+
+#include <boost/filesystem.hpp>
+#include <boost/test/unit_test.hpp>
+
 
 CWallet* pwalletMain;
 CClientUIInterface uiInterface;