Replace upercase O in ditc source

Added statements for unstressed vowels, change length/amplitude for unstressed vowels.

improved spanish prosody in tr_language.c

Added rule for suffix mente in es_rules

Translated language names

Added rules for letter spanish ce cedilla, see issue 130

Intonation: improved head and prehead in tune q6

This function should just discard the currently playing audio,
rather than close the audio device.  After all,
we will probably want to synthesize something else later.

Phonemes: fixed bad phoneme a before vowels,  improved unstressed a, unstressed o, set length for phoneme i

Added exceptions and review it_rules

Fixed length stressed vowels in tr_language.c (see #80).

Improved phonemes, new statements for [a] and long close [o].

Added last improvements in italian dict source tested on april-may 2016.