Add Heating / Cooling Design Day Temperatures

Th is issue is continuing what @alemenchaca started here:
https://github.com/mostaphaRoudsari/epwmap/issues/1

Namely, it would be great if the summary that pops up when you scroll over EPW files displayed the heating/cooling design day temperatures that are typically used to size HVAC systems and understand the coldest and warmest temperatures of a given climate. The usual way that these design temperatures are derived is by taking a temperature that represents 1 percentile of the coldest and warmest possible times of the year (since it's usually not reasonable to take the coldest temperature ever recorded in a given climate). Sometimes a 0.4 percentile is also used if a HVAC engineer needs to be particularly conservative. I'm imagining these values going right below the hours of outdoor comfort on the map:

Usually the easiest way to get these design temperatures is to pull them from the .stat file and I have highlighted where they are located here:

@mostaphaRoudsari , you can also calculate these values from analysis of the EPW data by sorting all dry bulb temperatures and then taking the 88th temperature for the 1% design day condition (since 8760 x 1% = 87.6) but the stat file method above is more accurate.

Let me know if you need help bringing this to fruition.

Start by tracing how EPW files are parsed and how the hover summary displays the hours of outdoor comfort on the map. Use the highlighted locations in the .stat file as the source for the heating and cooling design temperatures, with EPW analysis as the alternative described in the issue. Done means the summary displays both design temperatures below the outdoor-comfort hours.