[Bug localedata/12031] iconv -t ascii//translit with Greek characters

["egor at kobylkin dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=12031

--- Comment #16 from Egor Kobylkin <egor at kobylkin dot com> ---
AFAIK there are many versions of transcription tables for Greek to ASCII
transcription. Given that current iconf logic can only translit one to many but
not many to many symbols we take the "Standard" part of the following table

https://en.wikipedia.org/wiki/Romanization_of_Greek#Modern_Greek

and only keep the one letter Greek graphems. That "standard" seems to be close
to the ELOT 743 indeed but not the same. 

So we omit things like M and Μπ being transliterated as M and B accordingly.
Rather Μπ will be treated like two separate graphems and transliterated as Mp. 


Here is the list of some standards I have collected so far. There doesn't seem
a way to harmonize them all into one. But if anyone want to propose a solution
- please do.

+ ΕΛΟΤ 743 https://www.teicrete.gr/users/kutrulis/Ergalia/ELOT743.htm
Passports.
+ ISO 843 https://en.wikipedia.org/wiki/ISO_843
+ ALA-LC https://www.loc.gov/catdir/cpso/romanization/greek.pdf Book titles.
+ BGN/PCGN http://libraries.ucsd.edu/bib/fed/USBGN_romanization.pdf 
http://geonames.nga.mil/gns/html/Romanization/Romanization_Greek.pdf
Geographical names.

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