make the underlying lines easier to see, when we add proper grid

data, this might need adjusting again..

root/js/solardash.base.js

@@ -123,6 +123,7 @@ var solarchart = Highcharts.stockChart('solarchart', {
 		area: {
 			//stacking: 'normal',
 			lineColor: '#666666',
+			fillOpacity: .25,
 			lineWidth: 1,
 			marker: {
 				lineWidth: 1,