ParKF: Also load constant in when running Allen-via-Moore
When running Allen-via-Moore a segfault was created because the parameters are not loaded.
This MR fixes this and introduces a some additional warnings.
I propose test coverage for the with_parkf sequences in Moore!4775 (merged), though I'll leave it up to the experts if this is a good idea.
fyi: @dovombru
Edited by Lennart Uecker