Returns a dictionary containing geographic bus locations that are included in the NDD. The dicitonary structure is bus-index => (lon, lat). If getlims=true, the minmimum and maximum longitude and latitude coordinates are returned as well. Can be useful for plotting the grid.
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function get_locs(network_data::Dict{String,<:Any};getlims=false)
pos=Dict(
parse(Int64,i)=>(b["bus_lon"],b["bus_lat"])
for(i,b)innetwork_data["bus"]
)
### Check whether to return lon- and lat-limits or not