bug in svubversion 1.6.6: unmodified external directory is not deleted, when svn:externals is deleted.

Hello,

There is a serious bug in 1.6.6 (and in 1.6.5), external directory is
not deleted when svn:externals property is deleted.

That means that subsequent updates from a certain revision without any
modifications made to the target working copy will fail:

svn up -rN (svn:external set to "URL ext")

svn up -rN+1 (svn:external deleted)

svn up -rN+2 ("ext" directory added) - will fail because "ext" has not
been deleted!

Attached script reproduces the problem.

-- 
Alexander Kitaev,
TMate Software,
http://svnkit.com/ - Java [Sub]Versioning Library!
http://sqljet.com/ - Java SQLite Library!
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