Implemented SMTP submission proxy service.

example-config: Typofix

example-config: Added a note about protocol/local/remote {} sections.

example-config: Added auth_proxy_self setting.

example-config: Updated instance_name setting's comments.

master: Added instance_name setting, which is used to prefix processes in ps output.

Changed wiki.dovecot.org links to wiki2.dovecot.org

example-config: Uncommented !include_try local.conf At least one Linux distro wants this.

example-config: Added import_environment.

example-config: Moved include conf.d/*.conf last in dovecot.conf. This fixes problems where conf.d/ files try to modify settings in dovecot.conf, especially managesieve adding itself to protocols setting.

doveadm: Added client/server architecture support for running mail commands. This is done when doveadm_worker_count is non-zero.

example-config: Mention `doveconf -n` instead of `dovecot -n` --HG-- branch : HEAD

example-config: Moved disable_plaintext_auth to 10-auth.conf --HG-- branch : HEAD

example-config: Fixed example dict config filenames. --HG-- branch : HEAD

example-config: Added a note about !include file ordering. --HG-- branch : HEAD

Added support for tcpwrappers and potentially other login access checks. --HG-- branch : HEAD

example-config: Dropped ".ext" extension from dovecot.conf --HG-- branch : HEAD

example-config: Moved shutdown_clients to main dovecot.conf. --HG-- branch : HEAD

example-config: Updated listen setting's comment. --HG-- branch : HEAD

example-config: Updated listen setting's comments. --HG-- branch : HEAD

master: Added back "listen" setting, which is the default address for inet_listeners. --HG-- branch : HEAD

verbose_proctitle setting works again. --HG-- branch : HEAD

Split dovecot-example.conf to multiple files. Also it's now installed under docdir. --HG-- branch : HEAD