[Dovecot] Ubuntu packages and broken link in docs

[Alan McGinlay - SICS]

Hi,

Two things:
1. Does anyone know of a good PPA with updated packages of Dovecot for 
Ubuntu? "For the latest Dovecot for latest Ubuntu LTS see Xiaoka APT 
Repository. (Outdated. Could someone provide a ppa for latest stable 
Dovecot, please?)"

2. On the http://wiki2.dovecot.org/PrebuiltBinaries#Ubuntu page there 
is a link to a supposedly outdated PPA, the ppa page now redirects to an 
ad for the guys services so should probably be removed.

/Alan