Allow -noserver with bitcoind

Allow running bitcoind without server.

- Default to -server mode (of course) for bitcoind with SoftSetBoolArg
- Remove fForceServer argument from AppInit2
- Move fDaemon to a static variable in bitcoind

src/qt/bitcoin.cpp

@@ -289,7 +289,7 @@ int main(int argc, char *argv[])
         QObject::connect(pollShutdownTimer, SIGNAL(timeout()), guiref, SLOT(detectShutdown()));
         pollShutdownTimer->start(200);
 
-        if(AppInit2(threadGroup, false))
+        if(AppInit2(threadGroup))
         {
             {
                 // Put this in a block, so that the Model objects are cleaned up before