HELLO changes

[Dave Love]

These changes alter some language names to agree with the definitions
in the ICU locales database (somewhere under
<URL:http://oss.software.ibm.com/icu/>).  I added a maths example for
technical characters and removed `Unicode characters', since most the
characters in the file are in Unicode.  Also the `FORTRAN' example was
confusing since it doesn't start in column 7 as it should if you're in
the dark ages of upper-case only.

I think the ASCII-only lines should be removed as they don't help to
`illustrate a number of scripts'.

Sorry about the base64, but it will probably get mangled otherwise.

HELLO.diff
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