Re: svn_config_t is not thread-safe

Here's a patch that will fix the problem. It works by un-singletoning
SVNConfig, so to speak. I'm not entirely satisfied with it because
SVNConfig then has to be created many more times than necessary. It's
more of a proof-of-concept, really.

My initial attemp was to change SVNConfig::GetConfig() to return a
copy of the config via apr_hash_copy, but this didn't work, presumably
because apr_hash_copy() does a shallow copy. I think this direction
is the cleaner way to go. Perhaps a true clone would work, but I
don't have time to investigate this now.

Joel

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