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/cvs/cvscontrol.h

@@ -56,6 +56,9 @@ public:
     virtual bool vcsAdd(const QString &fileName);
     virtual bool vcsDelete(const QString &filename);
 
+    void emitRepositoryChanged(const QString &s);
+    void emitFilesChanged(const QStringList &l);
+
 signals:
     void enabledChanged(bool);