example: add abacus examples

[hongriTianqi]

Add abacus examples of fcc-Al.

[codecov-commenter]

Codecov Report

Merging #853 (bc471d4) into devel (5c17874) will increase coverage by 1.98%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##            devel     #853      +/-   ##
==========================================
+ Coverage   36.01%   38.00%   +1.98%     
==========================================
  Files          97       99       +2     
  Lines       17277    17754     +477     
==========================================
+ Hits         6223     6747     +524     
+ Misses      11054    11007      -47     

Impacted Files	Coverage Δ
dpgen/generator/run.py	62.50% <66.66%> (-0.05%)	⬇️
dpgen/auto_test/lib/abacus.py	84.75% <0.00%> (ø)
dpgen/auto_test/ABACUS.py	79.35% <0.00%> (ø)
dpgen/auto_test/lib/util.py	15.21% <0.00%> (+0.44%)	⬆️
dpgen/auto_test/common_prop.py	38.70% <0.00%> (+0.55%)	⬆️
dpgen/auto_test/reproduce.py	6.08% <0.00%> (+0.68%)	⬆️
dpgen/auto_test/common_equi.py	63.15% <0.00%> (+1.56%)	⬆️
dpgen/auto_test/Gamma.py	62.84% <0.00%> (+1.71%)	⬆️
dpgen/generator/lib/abacus_scf.py	88.62% <0.00%> (+2.20%)	⬆️
... and 9 more

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