refactor: delete relax_kspacing and md_kspacing in abacus init step

[hongriTianqi]

Delete relax_kspacing and md_kspacing in abacus init step, because kspacing has been added in ABACUS itself. They have different unit (one in 1/Bohr and another in 1/A), and may cause confusions.

[codecov-commenter]

Codecov Report

Merging #848 (8f2979f) into devel (40f66fd) will decrease coverage by 0.08%.
The diff coverage is 22.97%.

@@            Coverage Diff             @@
##            devel     #848      +/-   ##
==========================================
- Coverage   36.08%   36.00%   -0.09%     
==========================================
  Files          97       97              
  Lines       17169    17283     +114     
==========================================
+ Hits         6196     6223      +27     
- Misses      10973    11060      +87     

Impacted Files	Coverage Δ
dpgen/data/gen.py	47.64% <22.97%> (-0.84%)	⬇️
dpgen/generator/lib/make_calypso.py	70.06% <0.00%> (-7.46%)	⬇️
dpgen/generator/run.py	62.55% <0.00%> (-0.56%)	⬇️
dpgen/generator/lib/run_calypso.py	10.00% <0.00%> (ø)
dpgen/generator/lib/calypso_run_opt.py	0.00% <0.00%> (ø)
dpgen/generator/lib/calypso_check_outcar.py	0.00% <0.00%> (ø)
dpgen/generator/lib/calypso_run_model_devi.py	0.00% <0.00%> (ø)
dpgen/generator/arginfo.py	99.25% <0.00%> (+0.05%)	⬆️
dpgen/generator/lib/abacus_scf.py	86.41% <0.00%> (+0.34%)	⬆️
dpgen/generator/lib/parse_calypso.py	84.84% <0.00%> (+0.47%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us.