(Closes #3259) shorten generated names for basis/diff-basis arrays

[arporter]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.91%. Comparing base (97dd02d) to head (32766e2).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3264   +/-   ##
=======================================
  Coverage   99.91%   99.91%           
=======================================
  Files         376      376           
  Lines       53529    53553   +24     
=======================================
+ Hits        53484    53508   +24     
  Misses         45       45           

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[arporter]

This PR shortens the generated names used for various variables in order to avoid hitting compiler limitations as reported by Tom in #3259. Since we're no longer basing the names on existing variable names (which must be unique) I've had to increase the use of tags to ensure we cope in the face of name collisions.
One for @hiker, @LonelyCat124 or @sergisiso.
I've fired off the integration tests.