Replace multi-arg checksquare by map

[jishnub]

Following #559, this should reduce some unnecessary allocations in using the multi-argument checksquare.

[dkarrasch]

What if we changed the definition altogether?

checksquare(A...) = map(checksquare, A)

[dkarrasch]

I think there are more multi-arg cases.

[jishnub]

Changing the definition was the suggestion in the issue as well, but I wonder if that might be breaking (although I doubt it). It is documented to return a vector, and the function is listed as public on v1.11+.

[jishnub]

I've replaced the instances that I could find with the regex checksquare\(([a-zA-Z]+)\,[\s]*([a-zA-Z]+)\)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.81%. Comparing base (b265fea) to head (15036ff).
Report is 10 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1380   +/-   ##
=======================================
  Coverage   93.81%   93.81%           
=======================================
  Files          34       34           
  Lines       15717    15717           
=======================================
  Hits        14745    14745           
  Misses        972      972           

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