Changes default solver to scipy

[dalonsoa]

Description

Sets the default solver to scipy, updating also the settings files.

Fixes # N/A

Type of change

Please add a line in the relevant section of
CHANGELOG.md to
document the change (include PR #) - note reverse order of PR #s.

• New feature (non-breaking change which adds functionality)
• Optimization (non-breaking, back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (whatever its nature)

Key checklist

• All tests pass: $ python -m pytest
• The documentation builds and looks OK: $ python -m sphinx -b html docs docs/build

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.13%. Comparing base (a2a1b4f) to head (371f5d1).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #378      +/-   ##
===========================================
- Coverage    71.39%   71.13%   -0.26%     
===========================================
  Files           44       44              
  Lines         5887     5887              
  Branches      1162     1162              
===========================================
- Hits          4203     4188      -15     
- Misses        1364     1383      +19     
+ Partials       320      316       -4     

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[alexdewar]

LGTM!

[tsmbland]

Shall we merge this?

[ahawkes]

I think we hold off on this for now. I think it will be a breaking (or at least disconcerting) change for some models (that use adhoc by default)

[dalonsoa]

I'm going to close this. We will revisit in the future if/when needed.