mod_dav_svn: Use compressed svndiff1 deltas when delivering replayreports, if the client supports them.Previously, such reports have always been using uncompressed svndiff0format for deltas, even if the client has indicated that it would liketo see svndiff1 via the "Accept-Encoding" header. Compression canhave a noticeable performance impact over WAN or thin networks.* subversion/mod_dav_svn/reports/replay.c (struct edit_baton_t): Add new 'svndiff_version' field. (dav_svn__replay_report): Pass the negotiated svndiff version to ... (make_editor): ...this function that constructs an edit baton. (apply_textdelta): Use the negotiated svndiff version for deltas.