Fix bug with switch cm_inco0Factor for scaling investment cost of technologies, investment cost in policy runs are not overwritten by reference gdx in 05_initialCap anymore

[fschreyer]

Purpose of this PR

This fixes a bug for changing the investment cost in core/datainput with switches like cm_inco0Factor. Those changes were overwritten in policy runs at the end of the 05_initialCap module since the earlier change that initialCap is not run in policy runs anymore. Now, pm_inco0_t is not loaded from the input_ref.gdx anymore in policy runs. It is only loaded in case of cm_techcost = GLO where initialCap has an actual influence on pm_inco0_t. In this case, only the technologies modified by initialCap code are overwritten (ngcc etc.). I added a note to the above switches that those technologies are in this case still not affected by the switches. In all other cases, the switch should work as expected.

Type of change

(Make sure to delete from the Type-of-change list the items not relevant to your PR)

• Bug fix

Checklist:

• My code follows the coding etiquette
• I performed a self-review of my own code
• I explained my changes within the PR, particularly in hard-to-understand areas
• I checked that the in-code documentation is up-to-date
• All automated model tests pass (FAIL 0 in the output of make test)
• The changelog CHANGELOG.md has been updated correctly

Further information (optional):

• Test runs are here:
  /p/tmp/schreyer/Modeling/remind/Current/output/test_inco0_switch_glo_2023-08-29_11.42.31

• Comparison of results (what changes by this PR?):

[robertpietzcker]

Seems reasonable, especially the note in the declaration of cm_inco0Factor

One might still want to be able to change the investment costs in "GLO" runs, but then the next person who needs this can adjust the loading of pm_inco0_t in 05_initialcap/preloop so that the model does exactly what s/he needs.