Fix #277 (Inconsistent documentation for SVNAllowBulkUpdates)
* en/book/ch06-server-configuration.xml (svn.serverconfig.httpd.ref.mod_dav_svn): Indicate that the "Prefer" value of the SVNAllowBulkUpdates directive is new to 1.8.
* en/book/ch06-server-configuration.xml (svn.serverconfig.httpd.ref.mod_dav_svn): Document the "Prefer" value of the SVNAllowBulkUpdates directive.
1.8/zh: translation of chapter 5 in progress
Basic Usage refinement - in progress (3415)