WIP: Add AR5 TCR diagnosis definition

[znicholls]

• [ ] add TCR_def switch to diagnose_ecs_tcr to allow users to easily compare the effect of using different definitions should they so wish

[codecov-io]

Codecov Report

Merging #87 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #87   +/-   ##
=======================================
  Coverage   94.72%   94.72%           
=======================================
  Files           3        3           
  Lines         398      398           
  Branches       56       56           
=======================================
  Hits          377      377           
  Misses         12       12           
  Partials        9        9

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