Subversion: Add vcsTopic

This partially addresses QTCREATORBUG-12929 which is about svn commit no
longer showing output which does include the revision number

Change-Id: I149f1fea05a63cc80625ba5e02c10edbce471e1a
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/subversion/subversionplugin.h

@@ -91,6 +91,9 @@ public:
 
     static SubversionPlugin *instance();
 
+    QString monitorFile(const QString &repository) const;
+    QString synchronousTopic(const QString &repository) const;
+
 public slots:
     void vcsAnnotate(const QString &workingDir, const QString &file,
                      const QString &revision = QString(), int lineNumber = -1);