[MERGE] fix relpath calls at '/'

[Robert Collins]

currently as per bug 37036 transport.relpath('foo') when the transport
is at the root of its file system has a number of glitches.

I've added tests to check that relpath and abspath work correctly at the
root of their file system, and by implication that clone to the root
works for all transports.

This should fix bug 37036 but is rather less trivial than I had
hoped :O.

Rob
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