Replace all uses of FlintQQ and FlintZZ

[lgoettgens]

Some preparation for Nemocas/Nemo.jl#1935

[joschmitt]

Out of interest: I was raised with the believe that there is a difference between QQ and FlintQQ and that one should prefer FlintQQ. Did this change? (Was it just in Hecke but not in OSCAR?)

[lgoettgens]

Out of interest: I was raised with the believe that there is a difference between QQ and FlintQQ and that one should prefer FlintQQ. Did this change? (Was it just in Hecke but not in OSCAR?)

Maybe back in the time QQ referred to AbstractAlgebra.QQ (ie BigInt)? I am way too young for things like this

[codecov]

Codecov Report

Attention: Patch coverage is 59.09091% with 9 lines in your changes missing coverage. Please review.

Project coverage is 84.60%. Comparing base (852b6d1) to head (d61d988).
Report is 24 commits behind head on master.

Files with missing lines	Patch %	Lines
src/NumberTheory/NmbThy.jl	12.50%	7 Missing ⚠️
src/Rings/binomial_ideals.jl	71.42%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4261      +/-   ##
==========================================
- Coverage   84.60%   84.60%   -0.01%     
==========================================
  Files         640      640              
  Lines       85128    85117      -11     
==========================================
- Hits        72021    72009      -12     
- Misses      13107    13108       +1     

Files with missing lines	Coverage Δ
experimental/QuadFormAndIsom/test/runtests.jl	100.00% <100.00%> (ø)
src/NumberTheory/GaloisGrp/GaloisGrp.jl	78.61% <100.00%> (ø)
src/NumberTheory/GaloisGrp/Qt.jl	67.63% <100.00%> (ø)
src/PolyhedralGeometry/solving_integrally.jl	95.45% <ø> (ø)
src/Rings/NumberField.jl	90.16% <100.00%> (ø)
src/Rings/hilbert.jl	61.23% <ø> (ø)
src/Rings/mpoly-graded.jl	91.58% <100.00%> (ø)
src/Rings/binomial_ideals.jl	88.24% <71.42%> (ø)
src/NumberTheory/NmbThy.jl	60.10% <12.50%> (-1.04%)	⬇️

... and 2 files with indirect coverage changes

[lgoettgens]

Triage decided this is the way to go (ref #1379 (comment))