Changes to voice selection code to accept voice+variant voice names in SSML tags.
Changes to voice change code to use function DoVoiceChange().
lang=pt: Don't reduce phoneme [&~] to the more open [&] in unstressed syllables.
git-svn-id: https://espeak.svn.sourceforge.net/svnroot/espeak/trunk@83 d46cf337-b52f-0410-862d-fd96e6ae7743