Add set! methods for QQ/ZZMPolyRingElem

[fingolfin]

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[codecov]

Codecov Report

Attention: Patch coverage is 97.29730% with 1 line in your changes missing coverage. Please review.

Project coverage is 88.32%. Comparing base (f143dcb) to head (97433a4).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/flint/FlintTypes.jl	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1993      +/-   ##
==========================================
- Coverage   88.34%   88.32%   -0.03%     
==========================================
  Files          98       98              
  Lines       36207    36211       +4     
==========================================
- Hits        31987    31983       -4     
- Misses       4220     4228       +8     

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[fingolfin]

Maybe should also do this to make it more generally useful (based on a concrete need I just had ;-) )

Suggested change

	function set!(z::ZZMPolyRingElem, a::ZZMPolyRingElem)
	function set!(z::ZZMPolyRingElemOrPtr, a::ZZMPolyRingElemOrPtr; parent::ZZMPolyRing=parent(a))
	@ccall libflint.fmpz_mpoly_set(z::Ref{ZZMPolyRingElem}, a::Ref{ZZMPolyRingElem}, parent::Ref{ZZMPolyRing})::Nothing

Or maybe the kwarg should be ctx to better fit with that @lgoettgens does in PR #1911 (which I kinda forgot about, I thought this was long merged... perhaps we can get together on gather later or next week to discuss this)