NDC SSA

[RahelMA]

Purpose of this PR

Remove the special treatment of SSA in reaching NDC trajectory.

Dropping this fix would lead to substantial changes in SSA and other regions, see LAM (as well as overall emi reduction):

Full discussion here.

Type of change

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

• Bug fix
• Refactoring
• New feature
• Minor change (default scenarios show only small differences)
• 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
• I checked the log.txt file of my runs for newly introduced summation, fixing or variable name errors
• All automated model tests pass, executed after my final commit (FAIL 0 in the output of make test)
• The changelog CHANGELOG.md has been updated correctly

Further information (optional):

• Runs with these changes are here:
• Comparison of results (what changes by this PR?):