Weather Graphs

These graphs are work-in-progress, but they should be usable now.

There are various improvements I intend to make:

• Periodic auto-refresh (if it doesn't hurt the server). For now you will have to refresh by hand
• Various TODOs shown on the graphs themselves
• WIP - Filtering/aggregating/smoothing data, dependant on time range (trying some of this)
• WIP - Make it more useable on mobiles (if needed)
• DONE - Fixed artifacts on graphs which showed up especially for large time ranges (23/1/2020)
• DONE - Highlight if the data is out-of-date
• DONE - Allow changing time range (eg: past week, past 2 days at well as past 24 hours)
• DONE - Make the value axes self-adjusting to fit the data (where appropriate)

Plus stuff I do as it occurs to me.