New Issue: Array module review followup: Rename Array front/back to fist/last

18087, "stonea", "Array module review followup: Rename Array front/back to fist/last", "2021-07-21T15:15:31Z"

Array module review followup: Rename Array front/back to fist/last

This is a followup item for the Array module review.

One item we had agreement on is that we should rename the array front and back methods to first and last. This provides consistency with domain which uses first and last to refer to the first and last indices.

See also this comment:

https://github.com/Cray/chapel-private/issues/2194#issuecomment-870947834