Carriers' cost ratio in "conversion_plus tech"

[Lingkangjin]

Problem description

Describe the problem or error here

In "conversion_plus tech", with more than one carrier set, is not possible to define separately the "om_con" or "om_prod" between different carriers under the "cost" voice.
Is possible only to set the cost value regarding the primary carrier, and the secondary carrier cost should be calculated with "carrier_ratios". However, this ratio is energy-based, therefore is different by the cost ratio between carriers.

Calliope version

0.6.7

[brynpickering]

This is a design choice, not to have an arbitrary number of definable costs (+capacities, etc.) for conversion_plus technologies. This means that you can only link costs to primary_carrier_in and primary_carrier_out.