SSML: <voice>, if a language is specified, forget previously selected voice name.
Voice selection, convert language name to lower-case.
espeak-data/mbrola_ph files, allow use by both little and big-endian processors.
git-svn-id: https://espeak.svn.sourceforge.net/svnroot/espeak/trunk@149 d46cf337-b52f-0410-862d-fd96e6ae7743