Source code maintenance

Memory leaks:
- PeersDialog::insertPeers -> takeTopLevelItem, takeChild

- activate correct page on creating a new forum or channel from PeersDialog (problems with RS_RELEASE_VERSION)
  new static method to activate a page MainWindow::activatePage

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@2842 b45a01b8-16f6-495d-af2f-9b41ad6348cc

retroshare-gui/src/main.cpp

@@ -122,7 +122,7 @@ int main(int argc, char *argv[])
 
 	rsicontrol->StartupRetroShare();
 
-	MainWindow *w = new MainWindow;
+	MainWindow *w = MainWindow::Create ();
 
 	// I'm using a signal to transfer the hashing info to the mainwindow, because Qt schedules signals properly to
 	// avoid clashes between infos from threads.