relative externals fail with spaces

Hi,

A user reported a problem with relative externals on the TSVN mailing list:
http://tortoisesvn.tigris.org/servlets/ReadMsg?list=users&msgNo=14004

Attached is a test repository which shows this problem. I've verified
that the problem still exists in the Subversion trunk r33254, but only
for http/https served repositories. The problem does not exist for
file:/// or svn:// served repositories.

To reproduce the problem, check out /trunk from the attached repository,
which gives the error:

Error: URL 'https://192.168.2.5/svn/extrepo/trunk/folder with
space/libs/library1' is
Error: malformed or the scheme or host or path is missing

Stefan

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