[Patch] Fix for Issue #4395: 'svn upgrade' loses 1.6-client format files

Hi,

See attached my patch for fixing issue #4395.
http://subversion.tigris.org/issues/show_bug.cgi?id=4395

[[[
Fix issue 4395 by not deleting the format and entries file when we
upgrade from an 1.7 working copy.

* subversion/libsvn_wc/upgrade.c
  (wipe_obsolete_files): Add a boolean parameter remove_format_entries
    declaring whether we should wipe format and entry files.
  (svn_wc__wipe_postupgrade): Pass TRUE for remove_format_entries to
    keep the old behavior for pre-1.7 working copies.
  (svn_wc__upgrade_sdb): Pass FALSE for remove_format_entries to keep
    the files when upgrading from an 1.7 (or newer) working copy.
]]]

All tests still pass after applying that change, but it seems the change itself is not covered by any tests. Should I add a test case for it? If yes, how to get/create 1.6 and 1.7 working copies within the test suite?

Best regards

Markus Schaber

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