Reduce particles and run time for ecemep_emerson forward test

[halvarsu]

Fixes #239

[halvarsu]

Current dry dep and acc conc fields

[halvarsu]

Need to update snap_ecemep_emerson_expected.nc on threads

[heikoklein]

Need to update snap_ecemep_emerson_expected.nc on threads

Please set a new name, e.g. snap_ecemep_emerson_expected_20260218.nc . Otherwise all old versions will fail.

Please check also if the results are robust with strongly reduced particles. Check e.g. with ifort/ifx (different RNG).

[heikoklein]

The code looks ok, but the tests are not robust enough against compiler/RNG-changes.

ifx gives AssertionError: False is not true : Cs137_concentration at time(3): 1628.6971435546875 !~ 1748.637939453125 within 4%

It's possible that the number of particles was selected so high, that different RNG should not matter?

To compile with ifx on PPI:

cd src
rm -f current.mk
ln -s conda_ifx_pkgconfig.mk current.mk
conda activate /disk1/heiko/miniconda3/envs/oneapi
make test

Please update snap.input_ecemep_fimex and the corresponding expected, too, since the setup is very much related.

[heikoklein]

Adjusted a bit, but now it passes also with ifx. I had to remove the pure concentration tests, since vertical diffusion can be too varying with RNG. Used 1000 particles per release and kept the 9 hours.