change of preference parameters

[mleimbach]

Purpose of this PR

Change of preference parameters - time preference rate and intertemporal elasticity of substitution - adjust to more commonly used values. This requires an update of the mark ups/interest rates used in energy investment equations to keep them in line with market interest rates.

Type of change

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

• [x] Minor change (default scenarios show only small differences)
• [x] Fundamental change
• [ ] This change requires a documentation update

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
• [ ] I adjusted the reporting in remind2 where it was needed
• [ ] I adjusted forbiddenColumnNames in readCheckScenarioConfig.R in case the PR leads to deprecated switches
• [x] All automated model tests pass (FAIL 0 in the output of make test)
• [x] The changelog CHANGELOG.md has been updated correctly

Further information (optional):

• Test runs are here:
• Comparison of results (what changes by this PR?):