Egregious Code Duplication in PowerFlows

[GabrielKS]

The block:

    for (bus_no, ix) in bus_lookup
        bus_name = temp_bus_map[bus_no]
        bus = PSY.get_component(PSY.Bus, sys, bus_name)
        bus_type[ix] = PSY.get_bustype(bus)
        if bus_type[ix] == PSY.ACBusTypes.REF
            bus_angles[ix] = 0.0
        else
            bus_angles[ix] = PSY.get_angle(bus)
        end
        bus_magnitude[ix] = PSY.get_magnitude(bus)
    end

appears four times in PowerFlowData.jl. I'm sure there is more of this.

[jd-lara]

This might have been me.

[rodrigomha]

Closed via #45