Do not set user commands as rc.__currsys__

[hugobuddel]

Superset of #376

[codecov]

Codecov Report

Attention: Patch coverage is 90.47619% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 71.80%. Comparing base (88ee6d6) to head (e2026d4).

Files	Patch %	Lines
scopesim/effects/electronic.py	71.42%	2 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##           dev_master     #377      +/-   ##
==============================================
- Coverage       74.23%   71.80%   -2.44%     
==============================================
  Files              56       56              
  Lines            7864     7867       +3     
==============================================
- Hits             5838     5649     -189     
- Misses           2026     2218     +192     

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[hugobuddel]

I did run all the notebooks in both ScopeSim and the IRDB, and all tests should pass too (as they pass locally), so removing the draft status.

[hugobuddel]

So this and AstarVienna/irdb#157 kinda go together. So if we merge this, then the current IRDB packages will not work with the dev_master of ScopeSim.

But I think it is possible "fix" AstarVienna/irdb#157 so it works with both the current version of ScopeSim and the one after this is merged. Then we can create new IRDB packages that work with both versions, and then we can merge this.

[teutoburg]

Then we can create new IRDB packages that work with both versions, and then we can merge this.

New packages are here 👍