Implement a import-rdiff-backup command
Implement a import-rdiff-backup command

Signed-off-by: Zoran Zaric <d7dacae2c968388960bf8970080a980ed5c5dcb7@zoranzaric.de>
Reviewed-by: Gabriel Filion <8df7619ec42e51274a2f3ff6cd1afa366f63857b@gmail.com>

pombredanne/bup,mhoeher/bup,mhoeher/bup,mhoeher/bup,gevaerts/bup,ToxicFrog/bup,mhoeher/bup,jbaber/bup,pombredanne/bup,tjanez/bup,jbaber/bup,mhoeher/bup,apenwarr/bup,pombredanne/bup,ToxicFrog/bup,tjanez/bup,gevaerts/bup,ToxicFrog/bup,mhoeher/bup,tjanez/bup,jbaber/bup,ToxicFrog/bup,apenwarr/bup,ToxicFrog/bup,gevaerts/bup,tjanez/bup,tjanez/bup,jbaber/bup,tjanez/bup,jbaber/bup,jbaber/bup,gevaerts/bup,pombredanne/bup,gevaerts/bup,pombredanne/bup,apenwarr/bup,apenwarr/bup,pombredanne/bup