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/gitversioncontrol.cpp

@@ -96,5 +96,10 @@ QString GitVersionControl::findTopLevelForDirectory(const QString &directory) co
     return GitClient::findRepositoryForDirectory(directory);
 }
 
+void GitVersionControl::emitFilesChanged(const QStringList &l)
+{
+    emit filesChanged(l);
+}
+
 } // Internal
 } // Git