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

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

 rdiff.helper: (re)rename do_rdiff_conn function to do_rdiff_ssh_con, since the previous rename was not the good one.

 rdiff.helper: rename do_ssh_con function to do_rdiff_conn, in order not to pollute namespace... and allow future code factorization :)

 Fix: the "Cancel" buttons used to have a weird behaviour... at least

 Fix: used to expand '*' in default source directories

Also fixed a bug in the rdiff handler that caused a unary operation error if
the variable wasn't fixed

added more verbage to ninjahelper
added some IFS=$'' to easydialog
(this allows you to pass through blank lines).

added .disabled