I would like to move a file or folder from one place to another within the same repository without having to use Repo Browser to do it, and without creating two independent
Subversion does not yet have a first-class rename operations.
There's a 6-year-old bug on the problem: http://subversion.tigris.org/issues/show_bug.cgi?id=898
It's being considered for 1.6, now that merge tracking (a higher priority) has been added (in 1.5).