[m-rev.] diff: replace require/2 and error/1 in compiler

[Julien Fischer]

I've not posted this diff as it's long and boring.  It's at
/home/mercury/juliensf/tmp/REPLACE_ERROR_2.Diff for those who are interested.

Estimated hours taken: 4
Branches: main

compiler/*.m:
	Use expect/3 in place of require/2 throughout most of the
	compiler.

	Use unexpected/2 (or sorry/2) in place of error/1 in more
	places.

	Fix more dodgy assertion error messages.

	s/map(prog_var, mer_type)/vartypes/ where the latter is meant.

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