Add --version command-line option.

Allow hexadecimal numbers for UTF-8 bytes in rules in *_rules files.

wave_pulse.cpp, ensure wave_close is not called again while waiting.


git-svn-id: https://espeak.svn.sourceforge.net/svnroot/espeak/trunk@278 d46cf337-b52f-0410-862d-fd96e6ae7743