[Svnmerge] Failure to automatically locate branch point

[David Abrahams]

Using svnmerge downloaded today from
http://svn.collab.net/repos/svn/trunk/contrib/client-side/svnmerge/svnmerge.py
I tried to follow
http://www.orcaware.com/svn/wiki/Svnmerge.py#Merging_branches_back_to_trunk
and found that it didn't work (no changes were merged) unless I
followed the procedure supposedly required only for versions of
svnmerge.py older than r22788.

This was, specifically, merging
http://svn.boost.org/svn/boost/branches/RC_1_34_0/boost into
http://svn.boost.org/svn/boost/trunk@40670
in case someone wants to try and reproduce it.

-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com