#17 Better declaration of "Source" and "Target" in SyncPreview

[Claus Berghammer]

I think it would be a lot easier to follow the syncdirections, if
in the preview window the Source side and the target side
had its individual header. Now there stands the Source Path
AND the Target Path on the left side. I would prefer that
there is a header section on ech side, which includes the
words "Source" or "Target", and the Path in the line below.