Added sql functions to check if we really need to do any conversion.
-rw-r--r-- 19 .gitignore
-rw-r--r-- 2962 codepage_850.cs
-rw-r--r-- 3384 codepage_850.plperlu
-rw-r--r-- 1645 codepage_850.plpythonu
-rw-r--r-- 491 codepage_850.sql