Update sounds files.

* Add additional sounds prompts for say_enumeration
* Update the English conference sounds prompts so they are better
  quality and all sound more consistent
* Clean up the core-sounds-XX.txt and extra-sounds-XX.txt files to
  include all present sound files

Both core (en, fr, es) and extra (en, fr) sounds files have been updated.

(closes issue #16200)
Reported by: murf

(closes issue #17137)
Reported by: lmadsen

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@259526 65c4cc65-6c06-0410-ace0-fbb531ad65f3

sounds/Makefile

@@ -18,8 +18,8 @@
 PWD:=$(shell pwd)
 SOUNDS_DIR:=$(DESTDIR)$(ASTDATADIR)/sounds
 MOH_DIR:=$(DESTDIR)$(ASTDATADIR)/moh
-CORE_SOUNDS_VERSION:=1.4.17
-EXTRA_SOUNDS_VERSION:=1.4.10
+CORE_SOUNDS_VERSION:=1.4.18
+EXTRA_SOUNDS_VERSION:=1.4.11
 SOUNDS_URL:=http://downloads.asterisk.org/pub/telephony/sounds/releases
 MCS:=$(subst -EN-,-en-,$(MENUSELECT_CORE_SOUNDS))
 MCS:=$(subst -FR-,-fr-,$(MCS))