Add datastore list, filter and sort, add snapshot sorting

cmd/struct.go

@@ -519,3 +519,28 @@ type JailHost struct {
 	default_gateway6  string
 	default_interface string
 }
+
+type Datastore struct {
+	Name              string
+	Mountpoint        string
+	ZFSDataset        string
+	DefaultJailConfig JailConfig
+	Used              uint64
+	Referenced        uint64
+	Available         uint64
+}
+
+type DatastoreSort struct {
+	NameInc       datastoreLessFunc
+	NameDec       datastoreLessFunc
+	MountpointInc datastoreLessFunc
+	MountpointDec datastoreLessFunc
+	ZFSDatasetInc datastoreLessFunc
+	ZFSDatasetDec datastoreLessFunc
+	UsedInc       datastoreLessFunc
+	UsedDec       datastoreLessFunc
+	ReferencedInc datastoreLessFunc
+	ReferencedDec datastoreLessFunc
+	AvailableInc  datastoreLessFunc
+	AvailableDec  datastoreLessFunc
+}