Peak Electricity outputs don't include PV

[shorowit]

I noticed that the Peak Electricity outputs do not include PV. We should at least document that.

Perhaps we should have Total/Net versions so it's clear? That said, it will not be so simple to create the Net version because we are using a custom meter with the EnergyPlus Output:Table:Monthly object so that we don't have to post-process a bunch of timeseries data to get the peak. But our custom meter would need to both add and subtract output meters, but the EnergyPlus Meter:Custom and Meter:CustomDecrement only allow adding or subtracting, and you cannot reference a custom meter from another custom meter. Probably the best solution is to create an EMS program that does the adding and subtracting, and then use the EMS variable in the Output:Table:Monthly object.