+ added vservers support to duplicity handler
+ Note: the configuration is a bit different of rdiff
+ handler's one, but the default behavior is the same: have
+ a look to example.dup.
+ improved README
+ documented .disabled method.
+ corrected VROOTDIR default value.
+ added ninjahelper to the install instructions.
+ improved rdiff, dup and sys handlers' vservers support
+ prevent vserver-debiantools' $VROOTDIR/ARCHIVES directory
+ to be seen as a vserver
+ changes to sys handler
+ make use of configurable $VSERVERINFO instead of hard-coded vserver-info.
+ fixed dpkg existence test inside vserver.
+ fixed $nodpkg use.
+ changes to pgsql handler
+ now checks if the specified vserver is running.
+ now checks if $PGSQLDUMP/$PGSQLDUMPALL are available where needed.
+ now checks if "postgres" user exists on the host/vserver.
+