[m-rev.] for review: Do not escape character strings in internal atom representation.

[Julien Fischer]

On Mon, 26 May 2014, Peter Wang wrote:

> Branches: master, 14.01
>
> The internal representation of a character constant as an atom term
> should not use escaped character syntax; the escaping should occur
> when writing the external representation only.
>
> compiler/hlds_out_mode.m:
> compiler/intermod.m:
> compiler/prog_util.m:
> compiler/type_constraints.m:
> compiler/typecheck.m:
> 	Fix instances of the bug.
>
> tests/valid/Mercury.options
> tests/valid/Mmakefile
> tests/valid/intermod_char.m
> tests/valid/intermod_char2.m
> 	Add test case.  The .opt file was invalid because the character
> 	in the clause head was doubly-escaped.

That looks fine.

Cheers,
Julien.