Add AbstractArray conversions for AbstractQ

[dkarrasch]

Closes #1462.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.89%. Comparing base (7b21cab) to head (f6ae4fe).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1470   +/-   ##
=======================================
  Coverage   93.89%   93.89%           
=======================================
  Files          34       34           
  Lines       15926    15927    +1     
=======================================
+ Hits        14953    14955    +2     
+ Misses        973      972    -1     

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