*_list: Changed name to $combine (from $alt2) for the attribute which indicates that a word should combine with the next word.

Voices files: Added attribute "speed", which specified a percentage change to the speaking speeds which are used for this voice.


git-svn-id: https://espeak.svn.sourceforge.net/svnroot/espeak/trunk@229 d46cf337-b52f-0410-862d-fd96e6ae7743