Move some stuff out of HeckeMoreStuff.jl

[fingolfin]

No description provided.

[thofma]

test failure looks real

[fingolfin]

Indeed, I accidentally left in a change to fmpz.jl from another experiment.

[codecov]

Codecov Report

❌ Patch coverage is 21.87500% with 50 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.28%. Comparing base (9a25e23) to head (a94b9ca).

Files with missing lines	Patch %	Lines
src/flint/fmpz_mod_poly.jl	30.76%	18 Missing ⚠️
src/flint/gfp_elem.jl	0.00%	11 Missing ⚠️
src/flint/fmpz_poly.jl	0.00%	10 Missing ⚠️
src/flint/fmpz_mod_abs_series.jl	0.00%	6 Missing ⚠️
src/antic/nf_elem.jl	0.00%	3 Missing ⚠️
src/HeckeMoreStuff.jl	0.00%	1 Missing ⚠️
src/flint/nmod.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2230      +/-   ##
==========================================
- Coverage   88.29%   88.28%   -0.01%     
==========================================
  Files         100      100              
  Lines       37202    37202              
==========================================
- Hits        32847    32844       -3     
- Misses       4355     4358       +3     

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