Variable Name Standarization

BollingerBands.js

@@ -442,7 +442,7 @@
             if (timeLineCoordinateSystem.maxValue > 0) { return; } // Already calculated.
 
             let minValue = {
-                x: EARLIEST_DATE.valueOf(),
+                x: MIN_PLOTABLE_DATE.valueOf(),
                 y: 0
             };
 

PercentageBandwidth.js

@@ -447,7 +447,7 @@
             if (INFO_LOG === true) { logger.write("[INFO] recalculateScaleX -> Entering function."); }
 
             var minValue = {
-                x: EARLIEST_DATE.valueOf()
+                x: MIN_PLOTABLE_DATE.valueOf()
             };
 
             var maxValue = {