[bug #63018] font/devps/ZD: make glyphs accessible via their Unicode spellings

[Dave]

Follow-up Comment #3, bug #63018 (group groff):

[comment #0 original submission:]
> defining aliases (probably in tmac/ps.tmac) for \[OK] and \[rh] so
> that they can also be represented respectively by \[u2713] \[u261E]

On further thought, because these aliases should apply to both the ps and pdf
devices, they shouldn't be in a file that only the ps device reads.

Luckily, the font description file itself includes a mechanism to define
aliases for the same glyph.  From the info manual:

   A line in the 'charset' section can also have the form

     NAME "

identifying NAME as another name for the glyph mentioned in the preceding
line.

(On first blush, it may seem that defining this alias in font/devps/ZD still
only applies to the ps device.  However, font/devpdf is populated from
font/devps, so aliases in the devps font description file propagate to the
devpdf one.)


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