(probably) improve modular arithmetic

[sumiya11]

No description provided.

[codecov]

Codecov Report

Attention: 222 lines in your changes are missing coverage. Please review.

Comparison is base (9bd480f) 84.60% compared to head (f81777d) 82.13%.
Report is 2 commits behind head on master.

❗ Current head f81777d differs from pull request most recent head de1856b. Consider uploading reports for the commit de1856b to get more accurate results

Files	Patch %	Lines
src/f4/linalg.jl	26.10%	184 Missing ⚠️
src/utils/versioninfo.jl	0.00%	22 Missing ⚠️
src/utils/test_systems.jl	64.28%	5 Missing ⚠️
src/fglm/linear.jl	33.33%	4 Missing ⚠️
src/arithmetic/Zp.jl	91.89%	3 Missing ⚠️
src/groebner/parameters.jl	40.00%	3 Missing ⚠️
src/groebner/correctness.jl	94.44%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #99      +/-   ##
==========================================
- Coverage   84.60%   82.13%   -2.48%     
==========================================
  Files          47       48       +1     
  Lines        5955     6251     +296     
==========================================
+ Hits         5038     5134      +96     
- Misses        917     1117     +200     

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