Reinstate language "az" (Azerbaijani) as a test voice.
Language changes: ga, hy, pt, sk.
Generate character names for subscript and superscript letters and digits.
 

git-svn-id: https://espeak.svn.sourceforge.net/svnroot/espeak/trunk@347 d46cf337-b52f-0410-862d-fd96e6ae7743