Making nightly cpu vs gpu test use a new config script for the cpu compile. This is the minimize the differences to be only whether or not the openacc GPU code is enabled.
(details / githubweb)
Limiting mpace_b to 250 timestpes for gpu vs cpu test. The mpace_b test passed on my home GPU (RTX 3080), but not when run in jenkens on nelson (P4000). So either the tolerance is too strict, or we're running too many timesteps for mpace_b. Currently the largest difference on mpace_b multicol check is 3.31551e-05 on jenkins, so if this fails also I'll up the tolerance for mpace_b instead of further reducing timesteps run.
(details / githubweb)
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