more notes on graphs.. now that it looks like there can be multiple

data lines on both main and navigation, we can change how things are
organized, and here's the current idea for them..

NOTES.md

@@ -30,6 +30,15 @@ Graphs
 
 Note: HighCharts uses milliseconds since unix epoch for time stamps.
 
+(make an option to set the "zero" line, i.e. absolute, or consumption
+(i.e. net gen/consumption vs solar)
+
+Proposed graphs:
+Daily solar production total
+daily consumption total
+Per panel stacked production
+current production and consumption (5 minute intervals?)
+
 Grid Import/Export
 navigation: net import by hour or six hours