* Introduce consistenst time sorting (John Lawless)
* Check for source connectivity before trying backup (John Lawless)
* Defensive programming patch (John Lawless)
* Some code cleanups (argument parsing, usage) (Nico Schottelius)
* Only consider directories as sources when using -a (Nico Schottelius)
* Fix general parsing problem with -a (Nico Schottelius)