Connection of unused transfer-busses (Netzinseln) to existing grid

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ZNES: Finnish "Netzinsel" csv import-function and try/except in console execution part

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The 110kV dead-end connection function (heuristic) is disabled no, because this will be covered by a new, improved transfer-bus connection function.

I implemented a first transfer-bus connection function that connects unused transfer buses to the existing grid. Iterative, the closest substation to transfer-bus distance is connected first. Nevertheless, this is not always good, because often substations should obviously be connected to its nearest line and no to the nearest substation. The function will thus be re-implemented the following way:

• An initial buffer is set (e.g. 100km) and for a random unused transfer bus all transmission lines within this buffer are selected.
• The closest point from the transfer bus to all of these transmission lines will be searched. The distance to this point is saved in a variable
• The buffer is set to this distance (thus, in the next search only lines that are closer than the current smallest distance will be selected)
• The new buffer is applied to the next (random) unused transfer bus. "Continue When no line within this buffer". In case a new (better) smallest distance is found, the buffer is set to this distance
• This is done for every unused transfer bus. As a result the transfer bus that is closest to the grid can be identified.
  This transfer bus is connected to the grid in the following way:
• The existing line-geometry is split up at the "closest point". The length of the two new parts is calculated. In case one of the distances is smaller than 75m (thus, the closest point is close to a substation or grid bus) the transfer bus is directly connected to this bus.
  Otherwise a new bus is defined. The old line is replaced by the new split up parts. the transfer bus is connected to this bus (via ground cable).
• The transfer bus is deleted from the unused bus table.
• The initial buffer is reset to 100km and the loop starts again. This is done until all unused transfer busses are connected.

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Dead ends are dead

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Bug: Simplify branches stopped working...