Add the LConvEncoding encoding 'ISO Turkush' based on ready ISO-8859-1

[AlexTP]

I got the feature-request from a Turkish user about ISO Turkish encoding ISO-8859-9.
Wikipedia https://en.wikipedia.org/wiki/ISO/IEC_8859-9 tells that

>>It is identical to ISO/IEC 8859-1 except for these six replacements of Icelandic characters with characters unique to the Turkish alphabet:

Code: Pascal  [Select][+][-]

1. Position   0xD0 0xDD 0xDE 0xF0 0xFD 0xFE
2. 8859-9     Ğ    İ    Ş    ğ    ı    ş
3. 8859-1     Ð    Ý    Þ    ð    ý    þ
4.  

So maybe someone can make the encoding easily? he also needs to test it on real Turkish texts. Which I cannot do.

[SymbolicFrank]

You might want to bite the bullet and go UTF-8.

[AlexTP]

I made the patch for my EncConv package, will port it to LConvEncoding this week.