Issue 3895, rejecting invalid svn:mergeinfo on commit

http://subversion.tigris.org/issues/show_bug.cgi?id=3895

This issue is about rejecting commits that attempt to introduce invalid,
i.e. fails to parse, svn:mergeinfo. This has been fixed on trunk and
was backported to 1.6.17. It turns out that the fix was incomplete: it
didn't fix commits through mod_dav_svn, see issue 3953.

I voted for the 3895 backport but I've now realised it causes problems
for repositories that already include invalid mergeinfo: they can no
longer be copied by dump/load or svnsync. There is no easy way for
users to correct the problem.

Do we need to provide a way for users to handle such repositories?
Force the commit? Delete the mergeinfo? Attempt to correct the
mergeinfo?

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