copy,move: restore --no-traverse flag

The --no-traverse flag was not implemented when the new sync routines
(using the march package) was implemented.

This re-implements --no-traverse in march by trying to find a match
for each object with NewObject rather than from a directory listing.

fs/config.go

@@ -62,6 +62,7 @@ type ConfigInfo struct {
 	MaxDepth              int
 	IgnoreSize            bool
 	IgnoreChecksum        bool
+	NoTraverse            bool
 	NoUpdateModTime       bool
 	DataRateUnit          string
 	BackupDir             string