- rdiff: it's now possible to choose exactly which vservers should be
         backed-up, as it already was with duplicity handler, with the
	 "vsnames" configuration setting

handlers/dup: make use of new lib/vserver functionality

handlers/dup: now works when multiple vservers names are given (separated by space) in vsnames config variable

duplicity handler: warn if vsnames or vsinclude is enabled while vservers support is disabled in backupninja.conf

 Reverted indentation level to 3.

 Changed default indentation level to 8, to make it presbyopia-friendly

dup: fixed erroneous gpg-related options processing; example.dup: fixed erroneous comments about the way gpg options are used

Improved duplicity handler: option to disable remote files cleaning, optionnal backups gpg signing, option to specify the gpg key to use, nicelevel & testconnect options, optionnal string to pass to ssh/scp e.g. to use a non-default identity file ; created an example.dup file ; config is now split in sections.