* subversion/libsvn_wc/upgrade.c   (svn_wc__upgrade_sdb): Issue a friendly error if the WC format is 18.
* subversion/libsvn_wc/upgrade.c
  (svn_wc__upgrade_sdb): Issue a friendly error if the WC format is 18.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion