Install {8,16,32}Bits_Quotient kernel funcs as methods

[fingolfin]

This is an alternative to #2615.

Note that some benchmarks indicate that these kernel functions do provide a noticeable speed up: (here x32 and u32 are defined in tst/testinstall/wordrep.tst):

gap> GASMAN("collect"); for i in [1..1000000] do x:=x32/u32; od; time;
1542
gap> GASMAN("collect"); for i in [1..1000000] do x:=x32/u32; od; time;
1475
gap> GASMAN("collect"); for i in [1..1000000] do x:=32Bits_Quotient(x32,u32); od; time;
91
gap> GASMAN("collect"); for i in [1..1000000] do x:=32Bits_Quotient(x32,u32); od; time;
87

But I wonder if there is a reason they were not used?

Resolves #2504. Closes #2615.

[codecov]

Codecov Report

Merging #2616 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2616      +/-   ##
==========================================
- Coverage   74.81%    74.8%   -0.01%     
==========================================
  Files         479      479              
  Lines      242190   242190              
==========================================
- Hits       181184   181176       -8     
- Misses      61006    61014       +8

Impacted Files	Coverage Δ
lib/wordrep.gi	66.61% <ø> (ø)	⬆️
src/iostream.c	62.35% <0%> (-1.15%)	⬇️
hpcgap/lib/hpc/stdtasks.g	63.93% <0%> (-1.03%)	⬇️
src/stats.c	89.41% <0%> (-0.2%)	⬇️

[fingolfin]

@hulpke This is the alternative PR which tests 32Bit_Quotient and shows that it provides a performance boost.

[ThomasBreuer]

The comment which I had added to the first relevant method installation holds also for the other method installations.
As soon as this comment has been addressed, I will approve the pull request.

[ThomasBreuer]

This method would be applicable also to elements of, for example, FreeMonoid( IsSyllableWordsFamily, 2 ),
with the effect that corrupted objects arise.
If IsMultiplicativeElementWithInverse is required for the second argument then this cannot happen,
and one can use InstallMethod instead of InstallOtherMethod.

[fingolfin]

@ThomasBreuer Thank you! I just updated the PR based on your comments

[markuspf]

I think we should keep the functions and install them as methods, i.e. I prefer this PR over #2615