clone.js; add a field true_color

Thie field allow to get the color that a clone should get if it is not currently last selection.
link ot #3689

browser/js/clone.js

@@ -965,10 +965,9 @@ Clone.prototype = {
      *
      * */
     updateColor: function () {
+
         var allele;
-        if (this.m.focus == this.index){
-            this.color = "";
-        }else if (this.m.colorMethod == "abundance") {
+        if (this.m.colorMethod == "abundance") {
             var size = this.getSize()
             if (this.getCluster().length===0){ size = this.getSequenceSize() }
             if (size === 0){
@@ -1008,6 +1007,11 @@ Clone.prototype = {
         }else{
             this.color = "";
         }
+        this.true_color = this.color
+
+        if (this.m.focus == this.index){
+            this.color = "";
+        }
     },
     
     /**