bug#36717: 25.3; greek.el: deprecated vowel+oxia combinations should be replaced with vowel+tonos counterparts

[Robert Pluim]

>>>>> On Thu, 18 Jul 2019 11:03:10 +0200, Robert Alessi 
>>>>> <alessi@robertalessi.net> said:

    Robert> As of 2016, the latest versions of Unicode (as of 2016) have now
    Robert> formally deprecated and removed the vowel+oxia combinations from the
    Robert> Greek extended range, leaving only the vowel+tonos from the basic 
Greek
    Robert> and Coptic range.

    Robert> As a result of this deprecation, the sixteen characters found in
    Robert> greek.el (Quail package for inputting Greek) that use extended
    Robert> codepoints should be replaced with those that use basic codepoints. 
 All
    Robert> affected characters can be found here:
    --> 
    Robert> 
https://wiki.digitalclassicist.org/Greek_Unicode_duplicated_vowels#Affected_characters

I took a look at greek.el, that shouldn't be difficult. What about
GREEK OXIA vs GREEK TONOS as standalone characters? Should we replace
the former with the latter?

Robert