Add capacity and investment variables for DAC

[fschreyer]

This was demanded by the ariadne project.

Adds the variables

Cap|Carbon Management|DAC
New Cap|Carbon Management|DAC
Cumulative Cap|Carbon Management|DAC
Energy Investments|DAC.

Example Mif is here: /p/tmp/schreyer/Modeling/remind/FossilFree/output/EU27_NZ_CCS100Mt_2024-03-11_15.21.21/test_DAC_cap.mif.

[tabeado]

1. Is cap in native REMIND units? the native dac unit is GtC, so if you just multiply by 3.66 the unit would be Gt CO2/yr.
2. Do we have a standardized conversion factor for C to CO2 in remind2? In REMIND it is 3.666666666667, I would have used 3.67. Not a big difference of course, but might lead to checks not adding up?

[fschreyer]

Thanks.

On 1.) vm_cap is already multiplied by 1000 before (see here). ;-)

On 2.) Should be addressed now.