Code model: Update on changes from the versioning system.

Add changed signals to IVersionControl and
VCSManager and wire them to the update methods. Add a menu action for
manually updating. Improved version of reverted
7aa2411693.

Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>

src/plugins/git/gitcommand.cpp

@@ -177,6 +177,8 @@ void GitCommand::run()
         emit errorText(error);
 
     emit finished(ok, m_cookie);
+    if (ok)
+        emit success();
     // As it is used asynchronously, we need to delete ourselves
     this->deleteLater();
 }