added scenario snapshots support
Use qcow2 images instead of raw to support snapshots
force revert
fixed list output
fixed exception arguments
set cache=unsafe to speed up disk IO

and to make snapshots work faster and avoid hangs
Merge branch 'master' into jacalvo/snapshots

Conflicts:
	ChangeLog
new ANSTE::Status separated from ANSTE::Config
fixed package name
Merge branch 'master' into jacalvo/snapshots

Conflicts:
	ChangeLog
	Makefile
	src/ANSTE/Virtualizer/Virt.pm
fixed wrong paths
write current scenario in status file
status fixes and unit tests added
Merge branch 'master' into jacalvo/snapshots
consider status as "empty" if json file can't be read
anste-clean now checks running VMs and has new --force option
-shutdown destroy current scenario without need of filename as argument
Merge branch 'jacalvo/snapshots'

Conflicts:
	ChangeLog