lib/vserver.in [init_vservers] : canonicalize VROOTDIR (since duplicity et al. don't follow symlinks)

(I hate duplicated code!)

example.dup: fixed example vsnames syntax

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

. code formatting cleanup (three spaces indent)
. fixed bug which caused only first include/exclude dir to
  have "include = "
. fixed globbing bug with exclude

. code formatting cleanup (three spaces indent)

 Added (commented out) to backupninja.conf the default paths to programs such as
 PGSQLDUMP, so that users can figure out more easily they can customize them.
 

 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

 Try to make it less busy

 Updated formatting

 Updated changelog, and reformatted it to be more organized according to
 element changed

 vserver support added, database and dump directory selection added

 Updated rdiff-backup to do vserver selection using lib/vservers

 If vservers weren't enabled it was impossible to enter the src
 menu in ninjahelper due to how these functions returned. This sets
 the variable host_or_vserver='host' when vservers are not available
 and then returns with a nice exit code

 I think the first three items are required, not the last 3 :)

 Add global variable rdiff_title and change all the titles to use it

 Update changelog