disable all daemons managed by zentyal to have manual control over them

to avoid the start; stop; start sequence that makes the boot process slow
change versions to 3.1
install zenbuntu-core instead of zenbuntu-desktop in headless mode
added zenbuntu-core
update metapackages for 3.1
modified motd and added final message in headless install

also proper paths for zenbuntu-core
one more blank line
fixed regression with rc.local
wait if installation fails
use beta logo and check 3.1 updates
Package icon for the new IPS module
Remove "use GD" workaround in EBox::init()
Merge branch 'jacalvo/headless-installer'
Merge branch 'master' into jacalvo/override-daemons

Conflicts:
	main/core/ChangeLog
	main/dhcp/ChangeLog
	main/ntp/ChangeLog
	main/squid/ChangeLog
	main/webserver/ChangeLog
silent disable/stop of overriden daemons
Merge pull request #330 from Zentyal/jacalvo/override-daemons

disable all daemons managed by zentyal to have manual control over them
Merge branch 'master' into jacalvo/restructure-code

Conflicts:
	main/common/ChangeLog
	main/core/ChangeLog