[m-rev.] renaming parsing/unparsing modules

[Julien Fischer]

On Mon, 8 Feb 2016, Zoltan Somogyi wrote:

> As I discussed with Mark earlier today, I would like to rename
> the unparse.m module he just created, because there are several
> other modules that do unparsing: parse_tree_out*.m, prog_out.m,
> and mercury_to_mercury.m. Since all the predicates now in unparse.m
> convert parse tree components to terms, and none of parse_tree_out*.m
> do, I propose parse_tree_to_term.m as the new name.
>
> I would also like to rename those prog_io_*.m modules which do parsing
> (not all of them do) to names such as parse_goal.m, parse_dcg_goal.m,
> and so on.
>
> Opinions?

No objections to any of that from me.

Julien.