Merge branch 'db_version/56' into db_version/62

* db_version/56:
  Some versions of GraphViz transform the colour names to hexadecimal

javascript/pipeline_diagram.js

@@ -176,6 +176,8 @@ function pipeline_diagram_update(allCharts) {
 	    .attr("stroke",function() {
 		if($(this).attr("stroke") === "black") {
 		    return "black"
+        } else if($(this).attr("stroke") === "#000000") {
+		    return "black"
 		} else {
 		    return node_color
 		}