lang=vi: recognise combining accent characters (for tone accents).
Use a different intonation pattern, with more expression, for sentences which end in exclamation mark.


git-svn-id: https://espeak.svn.sourceforge.net/svnroot/espeak/trunk@112 d46cf337-b52f-0410-862d-fd96e6ae7743

Added new phonemes [s.] and [z.] (as common phonemes), use in Lang=ru, Lang=sv, Lang=hi
Remake WAV files for [s;] and [z;] phonemes.
espeak_Terminate(), set pointers to NULL after free().
espeak_Initialize(), returns EE_INTERNAL_ERROR (-1) if fails to allocate memory.
Change to the default tone setting (array: tone_points in voices.cpp).


git-svn-id: https://espeak.svn.sourceforge.net/svnroot/espeak/trunk@5 d46cf337-b52f-0410-862d-fd96e6ae7743