Move some stuff into more appropriate places

[fingolfin]

No description provided.

[codecov]

Codecov Report

Merging #1562 (ef4dc81) into master (fc0d071) will decrease coverage by 0.05%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1562      +/-   ##
==========================================
- Coverage   84.20%   84.15%   -0.05%     
==========================================
  Files          94       94              
  Lines       36615    36615              
==========================================
- Hits        30830    30814      -16     
- Misses       5785     5801      +16     

Files	Coverage Δ
src/HeckeMiscMatrix.jl	20.83% <ø> (+0.73%)	⬆️
src/HeckeMoreStuff.jl	2.84% <ø> (+<0.01%)	⬆️
src/flint/fmpq_mat.jl	89.70% <0.00%> (-0.63%)	⬇️
src/flint/nmod_mat.jl	91.93% <0.00%> (-1.14%)	⬇️
src/flint/fmpz_mat.jl	88.66% <0.00%> (-1.03%)	⬇️

... and 5 files with indirect coverage changes

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