nvnmd-v1 with 31-type chemical species

[LiuGroupHNU]

1. Add the nvnmd-v1 with se_atten descriptor and 31-type chemical species. nvnmd-v0 is the old version with se_a descriptor and 4-type chemical species.
2. Fix the error for map_flt_nvnmd.cpp for nvnmd-v1. An unexpected value of floor(-0.0)=-1 occurred at the index of the mapping table.
3. Improve the documentation about runing nvnmd in bohrium.

[LiuGroupHNU]

Conflicting files "source/tests/test_nvnmd_se_a.py" and "source/tests/test_nvnmd_utils.py" have been removed. Because the same unit tests are included in "source/tests/test_nvnmd_entrypoints.py".

[wanghan-iapcm]

Is it possible to further reduce the size of the weight files weight_v?_cnn.npy for testing? E.g. using smaller models for tests.

[njzjz]

Conflicting files "source/tests/test_nvnmd_se_a.py" and "source/tests/test_nvnmd_utils.py" have been removed. Because the same unit tests are included in "source/tests/test_nvnmd_entrypoints.py".

You need to resolve conflicts in your branch.

[codecov]

Codecov Report

Patch coverage: 86.14% and project coverage change: +0.55 🎉

Comparison is base (a2995b8) 78.36% compared to head (95e79a2) 78.92%.

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #2676      +/-   ##
==========================================
+ Coverage   78.36%   78.92%   +0.55%     
==========================================
  Files         235      236       +1     
  Lines       24506    25157     +651     
  Branches     1469     1477       +8     
==========================================
+ Hits        19204    19855     +651     
- Misses       4910     4912       +2     
+ Partials      392      390       -2     

Impacted Files	Coverage Δ
deepmd/nvnmd/entrypoints/train.py	15.74% <0.00%> (-32.84%)	⬇️
deepmd/nvnmd/entrypoints/wrap.py	78.80% <59.35%> (-20.18%)	⬇️
deepmd/nvnmd/utils/network.py	63.70% <76.92%> (+5.12%)	⬆️
deepmd/nvnmd/utils/weight.py	87.95% <83.87%> (-6.50%)	⬇️
source/lib/src/prod_env_mat_nvnmd.cc	95.45% <84.61%> (-4.55%)	⬇️
deepmd/descriptor/se_atten.py	93.79% <85.00%> (-0.44%)	⬇️
deepmd/nvnmd/entrypoints/mapt.py	86.96% <90.04%> (+14.96%)	⬆️
deepmd/nvnmd/descriptor/se_atten.py	90.62% <90.62%> (ø)
source/op/map_flt_nvnmd.cc	98.52% <96.96%> (+2.94%)	⬆️
source/op/prod_env_mat_multi_device_nvnmd.cc	95.14% <97.00%> (+1.52%)	⬆️
... and 9 more

... and 18 files with indirect coverage changes

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[wanghan-iapcm]

@MoPinghui if your pr is ready for review, plz click the re-request bottoms besides the reviewers.