Thanks to Ian Beckwith <ianb@erislabs.net> for the patch.

updated the example.maildir to include this option, as well as detail the missing desid_file, destport

The modelines added match the emacs lines already present and also set
the filetype to sh (just like the emacs lines).

Previously, there were many indentation styles in use: Real tabs, 2, 3
or 4 spaces, mixing these within the same file, function or even within
a single line.

This commit changes all bash scripts in the handlers, src and lib dirs
to use consistent indentation: three spaces are now used everywhere.
Other files (e.g. Makefiles) are left untouched.

Additionally, this commit removes all trailing whitespace.

           maildirs, rather than just looking in the directories [a-zA-Z0-9], thanks
           for the patch from chris@cenolan.com (Trac#43)

dup: added option --force to cleanup and remove-older-than commands, else they actually do not do anything

sys: fix catifexec invocations with arguments to prevent "line 191: [: too many arguments" error messages

sys: fixed debconf-get-selections search in VServers, especially in case it is not available on the host

added more robust mdadm raid device capture, by actually scanning active arrays via mdadm, rather than just catting the mdadm.conf file, which may be empty

fixed catifexec function to actually work, also now takes arguments that are passed, thanks to a report from John Hallam

add the ability to save the debconf package selection states in the sys handler, which aides in restoring installed packages with the right choices made

sys: support selection of VServers to run on with the new vsnames configuration option (Closes: Trac#45)

lib/vserver: added vservers_running function, use it in sys handler (to ease future fix for Trac#45)

dup: support every duplicity-supported transport with new configuration option desturl (Closes: #483712, #346040, Trac#2)

ssh identity file, defaulting to the expected /root/.ssh/id_rsa. This
is important to have if you are trying to backup to a different user
on a backuphost than other handlers are using. For example, if the
rdiff handler is connecting to backalbatross@backupserver-pn using
/root/.ssh/id_rsa for public key authentication, and you want to
configure the maildir handler to connect as user
backmaildir@backupserver-pn you will might want to specify a different
identity file for that authentication (if you do not want to share the
id file between the 'backalbatross' and 'backmaildir' users). 

Note: this cannot be accomplished with a ssh config file because that
file is host based, ie. you can only specify one user per host
specified in the config