Switch from FiniteField to finite_field

[fingolfin]

Command used to create this PR:

git grep -l -w FiniteField | xargs perl -pi -e 's;\bFiniteField\b;finite_field;g'

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (8f64388) 74.46% compared to head (379ee51) 74.56%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1231      +/-   ##
==========================================
+ Coverage   74.46%   74.56%   +0.09%     
==========================================
  Files         346      346              
  Lines      110830   110994     +164     
==========================================
+ Hits        82534    82761     +227     
+ Misses      28296    28233      -63     

Files	Coverage Δ
src/GenOrd/Ideal.jl	78.32% <100.00%> (ø)
src/LocalField/LocalField.jl	74.46% <100.00%> (ø)
src/LocalField/qAdic.jl	76.11% <100.00%> (ø)
src/Misc/Poly.jl	62.11% <ø> (ø)
src/Misc/RelFiniteField.jl	73.47% <100.00%> (ø)
src/NumField/NfAbs/Simplify.jl	89.47% <100.00%> (ø)
src/NumFieldOrd/NfOrd/Hensel.jl	86.22% <ø> (ø)
src/NumFieldOrd/NfOrd/Ideal/Prime.jl	82.56% <100.00%> (+0.55%)	⬆️
src/NumFieldOrd/NfOrd/MaxOrd/Polygons.jl	89.17% <100.00%> (ø)
src/QuadForm/Quad/NormalForm.jl	99.70% <100.00%> (ø)
... and 2 more

... and 30 files with indirect coverage changes

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