[Dovecot] Getting rid of the common newbie problems

[Francisco Reyes]

Timo Sirainen writes:

> 1) Split the config files, so the less used settings are separate files

I think that would be good.
Specially if you could have a tool chain that would produce both files from 
one source.
  
> 2) Remove some of the settings completely from dovecot-example.conf,
> although they could still exist (mail_cache_fields,
> mail_never_cache_fields at least)

Are these settings only needed for debugging?
Would they be documented anywhere? 
 
> 3) Make the comments smaller and add more pointers to docs/wiki/ files.

Good.