New: backup-image creates _TS.tar.bz2 archive
New: stop-vm using qemu system_powerdown thrue monitor socket
New: status command checks monitor and image in running processes
Fix: target file string check + enabled "./", "filename" forms
Changes: run-vm changed to start-vm
Signed-off-by: Miroslav Safr <Miroslav.Safr@gmail.com>

Signed-off-by: Miroslav Safr <Miroslav.Safr@gmail.com>