More fixes for &--; sequences.
lang=es: use phoneme [O] for letter 'o' except at end of word.
leng=es: attempt to improve single 'r' between two vowels.


git-svn-id: https://espeak.svn.sourceforge.net/svnroot/espeak/trunk@139 d46cf337-b52f-0410-862d-fd96e6ae7743

Treat echo-delay = 0 as "no echo", even if ech-amplitude is set.
lang=ru, fix crash for "words" which has produce no phonemes (wg. ":").


git-svn-id: https://espeak.svn.sourceforge.net/svnroot/espeak/trunk@88 d46cf337-b52f-0410-862d-fd96e6ae7743