Merge branch 'cleanup/remove-delp-1pnc' into 'master'

Merged Timo Koch requested to merge cherry-pick-dd66a512 into releases/3.5

[cleanup][1pnc] Remove delp from reference solutions

See merge request !179 (merged)

(cherry picked from commit dd66a512)

4daaa04c [cleanup][1pnc] Remove delp from reference solutions

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