(Closes #2755) Bug fix for psyad failing to transform array assignment

[arporter]

A small change that (pleasingly) only involved me updating some code to remove an old restriction. @DrTVockerodtMO please could you try this branch and let me know whether it solves your problem?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.86%. Comparing base (1b55ac0) to head (fb796c9).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2767   +/-   ##
=======================================
  Coverage   99.86%   99.86%           
=======================================
  Files         354      354           
  Lines       49031    49035    +4     
=======================================
+ Hits        48967    48971    +4     
  Misses         64       64           

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[arporter]

This needs a 'science' review by @DrTVockerodtMO and then I'll put it up for proper code review.

[DrTVockerodtMO]

This needs a 'science' review by @DrTVockerodtMO and then I'll put it up for proper code review.

Will be happy to, just need to figure out how to test specific branches on our system and I'll have a look!

[arporter]

@DrTVockerodtMO and I have jointly test this branch against some kernels and everything looks OK. This is therefore ready for review. It's not a big change. Could be one for @hiker, @sergisiso, @LonelyCat124

[arporter]

I've just set the integration tests going.