Resolve "sg15 pseudo set incorrectly treated as an expermiental feature"

Description

Remove experimental states to SG15 pseudo set (again).

News snippet

Remove experimental states to SG15 pseudo set (again).

Checklist

• I have checked that my code follows the Octopus coding standards
• I have added tests for all the new features added in this request.

Closes #243 (closed)

changed milestone to %9.2

added Bug label

approved this merge request

mentioned in issue #243 (closed)

Codecov Report

Merging #715 into hotfix-9.2 will decrease coverage by <.01%. The diff coverage is n/a.

@@              Coverage Diff               @@
##           hotfix-9.2     #715      +/-   ##
==============================================
- Coverage       69.51%   69.51%   -0.01%     
==============================================
  Files             458      458              
  Lines           86892    86891       -1     
==============================================
- Hits            60401    60400       -1     
  Misses          26491    26491

Impacted Files	Coverage Δ
src/species/species.F90	77.41% <ø> (-0.03%)

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assigned to @martin.lueders

approved this merge request

merged