added some vserver documentation to README and to the handlers

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Duplicity handler example file (example.dup) : uploaded for real, this time, and added a note about symlink management weirdness in "include = " config lines.

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.

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rdiff works with sshd banner... rdiff local dest works... create logfile... when=hourly... rdiff nice...

time created instead of in numeric order.

well, not really, but i worked around a bug that i don't understand.

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ignore rsync error code 24
ignore cp return code.

also, now it actually finds all disks in partition report.