add InitMessage() to noui and use debug.log for GUI

- this pull adds an InitMessage() function to noui.cpp, which outputs init
  messages to debug.log (this allows to remove some printf() calls from
  init.cpp)
- change InitMessage() in bitcoin.cpp to also write init messages to
  debug.log to ensure nothting is missing in the log because of the
  removal of printf() calls in init.cpp

src/init.cpp

@@ -742,7 +742,7 @@ bool AppInit2()
     nCoinCacheSize = nTotalCache / 300; // coins in memory require around 300 bytes
 
     uiInterface.InitMessage(_("Loading block index..."));
-    printf("Loading block index...\n");
+
     nStart = GetTimeMillis();
     pblocktree = new CBlockTreeDB(nBlockTreeDBCache, false, fReindex);
     pcoinsdbview = new CCoinsViewDB(nCoinDBCache, false, fReindex);
@@ -799,7 +799,7 @@ bool AppInit2()
     // ********************************************************* Step 8: load wallet
 
     uiInterface.InitMessage(_("Loading wallet..."));
-    printf("Loading wallet...\n");
+
     nStart = GetTimeMillis();
     bool fFirstRun = true;
     pwalletMain = new CWallet("wallet.dat");
@@ -897,7 +897,7 @@ bool AppInit2()
     // ********************************************************* Step 10: load peers
 
     uiInterface.InitMessage(_("Loading addresses..."));
-    printf("Loading addresses...\n");
+
     nStart = GetTimeMillis();
 
     {
@@ -932,7 +932,6 @@ bool AppInit2()
     // ********************************************************* Step 12: finished
 
     uiInterface.InitMessage(_("Done loading"));
-    printf("Done loading\n");
 
     if (!strErrors.str().empty())
         return InitError(strErrors.str());

src/noui.cpp

@@ -37,9 +37,15 @@ static bool noui_ThreadSafeAskFee(int64 /*nFeeRequired*/)
     return true;
 }
 
+static void noui_InitMessage(const std::string &message)
+{
+    printf("init message: %s\n", message.c_str());
+}
+
 void noui_connect()
 {
     // Connect bitcoind signal handlers
     uiInterface.ThreadSafeMessageBox.connect(noui_ThreadSafeMessageBox);
     uiInterface.ThreadSafeAskFee.connect(noui_ThreadSafeAskFee);
+    uiInterface.InitMessage.connect(noui_InitMessage);
 }

src/qt/bitcoin.cpp

@@ -86,6 +86,7 @@ static void InitMessage(const std::string &message)
         splashref->showMessage(QString::fromStdString(message), Qt::AlignBottom|Qt::AlignHCenter, QColor(255,255,200));
         QApplication::instance()->processEvents();
     }
+    printf("init message: %s\n", message.c_str());
 }
 
 static void QueueShutdown()