Mercurial: Run update after pull

Get output of pull command and emit signal if update/merge is needed. On
update show update dialog.

Change-Id: I814f76daf3d89d0bd9485ed42a224b6b5d78bcb3
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/mercurial/mercurialplugin.cpp

@@ -140,6 +140,7 @@ bool MercurialPlugin::initialize(const QStringList & /* arguments */, QString *
     mercurialSettings.readSettings(core->settings());
 
     connect(m_client, SIGNAL(changed(QVariant)), versionControl(), SLOT(changed(QVariant)));
+    connect(m_client, SIGNAL(needUpdate()), this, SLOT(update()));
 
     static const char *describeSlot = SLOT(view(QString,QString));
     const int editorCount = sizeof(editorParameters)/sizeof(editorParameters[0]);