Move QQMatrix(::ZZMatrix) constructor

[fingolfin]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 87.32%. Comparing base (7894c21) to head (65f23be).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/flint/fmpq_mat.jl	0.00%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1868   +/-   ##
=======================================
  Coverage   87.31%   87.32%           
=======================================
  Files          97       97           
  Lines       35858    35858           
=======================================
+ Hits        31311    31314    +3     
+ Misses       4547     4544    -3     

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