make pairwise_dprc model work with MPI

[njzjz]

• make aparam accepts nall instead of nloc. A variable fitting_attr/aparam_nall (dtype=bool) controls the behavior.
  • enable this behavior for se_a_mask, by the way
• fix the shape of atomic energy in the pairwise DPRc model, which is nloc instead of nall
• set the minimal nloc to 1, as when nloc=0, many OPs (such as prod_force) throw floating-point exception
• fix backward map when the shape of nloc is padded

[codecov]

Codecov Report

Patch coverage: 66.66% and project coverage change: -3.91% ⚠️

Comparison is base (445ec23) 79.40% compared to head (ca64d54) 75.49%.
Report is 6 commits behind head on devel.

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #2818      +/-   ##
==========================================
- Coverage   79.40%   75.49%   -3.91%     
==========================================
  Files         244      242       -2     
  Lines       25909    24204    -1705     
  Branches     1533     1537       +4     
==========================================
- Hits        20573    18273    -2300     
- Misses       4939     5014      +75     
- Partials      397      917     +520     

Files Changed	Coverage Δ
deepmd/entrypoints/freeze.py	59.17% <ø> (ø)
source/api_cc/include/common.h	100.00% <ø> (ø)
source/api_c/include/deepmd.hpp	84.29% <28.57%> (-1.52%)	⬇️
source/api_cc/src/common.cc	78.36% <55.55%> (-0.82%)	⬇️
source/op/pairwise.cc	84.61% <60.00%> (+83.82%)	⬆️
source/api_cc/src/DeepPot.cc	74.34% <66.66%> (-0.18%)	⬇️
deepmd/descriptor/se_a_mask.py	85.71% <100.00%> (+0.25%)	⬆️
deepmd/model/pairwise_dprc.py	96.49% <100.00%> (+0.09%)	⬆️
source/api_c/src/c_api.cc	81.20% <100.00%> (+0.38%)	⬆️
source/api_cc/include/DeepPot.h	96.29% <100.00%> (+1.05%)	⬆️
... and 1 more

... and 68 files with indirect coverage changes

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