Cleanup of old cost calculation method

[lottevanvlimmeren]

During the cost update project, a new method for cost calculation has been written. The new method does not use the fixed and variable costs anymore, but considers the CAPEX and OPEX. Part of the old method is still included in the code (/app/models/qernel/node_api/cost.rb), and should be cleaned up. The old total cost calculation should especially be removed, since this does not reflect on the new total costs anymore.

When the total cost calculation is removed from the file, and the energy graph is opened locally, error messages show up in the node information. This should be updated as well.

Notifying @DorinevanderVlies

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[DorinevanderVlies]

@noracato this is finished right?

[noracato]

Unfortunately no. I keep on hitting roadblocks: many of the merit order calculations rely on the methods we wanted to remove because they were deemed redundant.