Add render checker color tolerance to sip

python/core/qgsrenderchecker.sip

@@ -37,6 +37,14 @@ class QgsRenderChecker
     void setRenderedImage( QString theImageFileName );
     void setMapRenderer( QgsMapRenderer *  thepMapRenderer ) /Deprecated/;
     void setMapSettings( const QgsMapSettings& mapSettings );
+
+    /** Set tolerance for color components used by runTest() and compareImages().
+     * Default value is 0.
+     * @param theColorTolerance is maximum difference for each color component
+     * including alpha to be considered correct.
+     * @note added in 2.1
+     */
+    void setColorTolerance( unsigned int theColorTolerance );
     /**
      * Test using renderer to generate the image to be compared.
      * @param theTestName - to be used as the basis for writing a file to