Ahem fonts

I'm trying to make sense of what we have in the fonts directory…

We have "ahem3.ttf" in fonts/, and an "AHEM____.TTF" in fonts/ahem/.

Both of these fonts claim to be "Ahem" in the "Ahem" family, so only one
can be installed/active at a time. ahem3.ttf seems to have a higher version
number, and a few more characters.

I presume ahem3.ttf is required by some tests (as why else add the extra
characters?): it was added in 2010 by Aaron Eicholz in an absolute massive
commit. Should we just drop the old AHEM____.ttf?

The other files within fonts/ahem/ appear to be a Postscript copy of the
AHEM____.TTF, and a (Classic Mac) Font Suitcase that has been *.sit
compressed (probably because it relies on resource forks to get preserved).
Given I don't think anyone is likely to run tests on a platform that
doesn't support TrueType fonts, we should likely just drop them—so all we
have to do is work out which of the two Ahem copies we should be keeping!

We might want to also add a LICENSE file or two for the sake of clarity
around the fonts: fonts/ahem/ contains a COPYING (contrary to the naming
used everywhere else in the repo!) declaring it to be CC0; fonts/ahem3.ttf
contains metadata within the file declaring it to be CC0; the fonts in
fonts/ahem-extra/, however, make no such comment—they appear to be based on
fonts/ahem/AHEM____.TTF, but given they make no further comment, I presume
the LICENSE at the top of the repo applies (FWIW, they appear to originate
in the massive MS 2.1 dump, in case anyone from MS knows whether the
license change from the original was deliberate).

/Geoffrey