Transliterating Greek (and Latin)

A thread on classics-l led to a request by Daniel Riaño that we should release the code we use in Pleiades to transliterate Greek. This code also can be used to verify that a string contains only valid UTF-8 characters for Greek (and also for Latin), prior to running the transliteration. Thanks to Sean's help, it's now released on pypi under a BSD license. Coptic's next.

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