* build-aux/csvm2csv: Fail on invalid var definition.
(expand_vars): Fail in invalid reference.
(parseline): Fail on non-numeric range.
* build-aux/test/test-csvm2csv
(test-fail-unknown-var-ref, test-fail-non-numeric-range)
(test-fail-invalid-var-dfn): New tests.
This allows variables to contain any type of expansion, treating them
as (recursively) string replacements.
* csvm2csv: Add Copyright year.
(expand_vars): New function.
(parseline): Use it. Expand before all other replacements so that
variable expansions may support all types of expressions. Expand
variables in range expressions.
* test/test-csvm2csv: New file.
Oops---we do not want a newline as part of the preimage, which is what
`<<<' does.
* build-aux/list2typedef (output-item)[value]: Remove newline from preimage.
* build-aux/test/test-list2typedef (test-typedef-gen): Update hashes.
(test-collision-value-check): Add new collisions.
Mike Gerwitz