union: fix so all integration tests pass

* Fix error handling in List and NewObject
* Fix Precision in case we have precision > time.Second
* Fix Features - all binary features are possible
* Fix integration tests using new test facilities

backend/union/union_test.go

@@ -4,14 +4,15 @@ package union_test
 import (
 	"testing"
 
-	"github.com/ncw/rclone/backend/local"
+	_ "github.com/ncw/rclone/backend/local"
 	"github.com/ncw/rclone/fstest/fstests"
 )
 
 // TestIntegration runs integration tests against the remote
 func TestIntegration(t *testing.T) {
 	fstests.Run(t, &fstests.Opt{
-		RemoteName: "TestUnion:",
-		NilObject:  (*local.Object)(nil),
+		RemoteName:  "TestUnion:",
+		NilObject:   nil,
+		SkipFsMatch: true,
 	})
 }