[bug] create_bus supports coords but they dont get plotted by simple_plot and are not documented fully

[KS-HTK]

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• [X] Browse the tutorials and tests for usefull code snippets and examples of use

• [X] Reproduced the issue after updating with pip install --upgrade pandapower (or git pull)

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Reproducible Example

import pandapower as pp
from pandapower.plotting import simple_plot
import matplotlib.pyplot as plt

net = pp.create_empty_network()

b1 = pp.create_bus(net, 20., "BusBar0", coords=[(1, 1), (5, 5)])
b2 = pp.create_bus(net, 20., "Bus0", geodata=(3, 7))
b3 = pp.create_bus(net, 20., "Bus1", geodata=(5, 7))

pp.create_line(net, from_bus=b1, to_bus=b2, length_km=1., std_type="NAYY 4x50 SE")
pp.create_line(net, from_bus=b2, to_bus=b3, length_km=1., std_type="NAYY 4x50 SE")

pp.create_line(net, from_bus=b1, to_bus=b3, length_km=1., std_type="NAYY 4x50 SE", geodata=[(2, 2), (2, 4), (5, 7)])

print(net.bus_geodata[net.bus["name"]=="BusBar0"])

simple_plot(net)
plt.show()

Issue Description and Traceback

The example should show three lines and three buses but only two line gets drawn and the third bus does not show up.

This is the result of busbar type of geometries not being drawn by simple plot. The coords argument of create_bus is only partially documented. It is documented in the create_bus function. But it is not documented that it is stored in bus_geodata table. The test_network does not contain any such bus so it is mostly untested. simple_plot ignores any bus that has no x, y values in bus_geodata. It generates line geodata from the from_bus and to_bus values which leads it to ignore any lines that end at a busbar, and do not have their own geodata. Also lines that have their own geodata appear to end in nothing as the bus is missing.

I would prefer the support for coords being droped from bus altogether as drawing a bus in the style of a Line is also ill advised. This would mean every bus has a Point geometry and every line has a LineString geometry, simplifying plotting a network altogether. Else the coords needs to be documented and plotting functions updated to handle the fact that a bus can have a LineString geometry.

Expected Behavior

The bus should get drawn.

Installed Versions

• python version: 3.10.11
• pandas version: 2.0.3
• networkx version: 3.1
• scipy version: 1.11.1
• numpy version: 1.24.4
• packaging version: 23.1
• tqdm version: 4.65.0
• deepdiff version: 6.3.1
• Operating System name/version: Windows 10

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