g⍨∘f⍨ → f⍛g

[bear8642]

Describe what this PR changes:

This change replaces the g⍨∘f⍨ spelling of Behind with f⍛g

If you've made changes to table.tsv:

• from your APL session, check that the table is well-formatted
  • ]link.import # path/aplcart
  • Test'path/aplcart/table.tsv' should return 1
    Thank you for your contribution to APLcart, @abrudz will have a look as soon as convenient.

[abrudz]

I'll let this rest until 20.0 is released.

[bear8642]

Cool! You might want to squish commits so end up with a nice commit message for the change.

[bear8642]

Seems Test'path/aplcart/table.tsv' is currently 0 both here and in master.
Not sure what's caused that.