Improve batch inserts.

1) Instead of making dbrm calls to writeVBEntry() per block,
     we make these calls per batch. This can have non-trivial
     reductions in the overhead of these calls if the batch size
     is large.

  2) In dmlproc, do not deserialize the whole insertpackage, which
     consists of the complete record set per column, which would be
     wasteful as we only need some metadata fields from insertpackage
     here. This is only done for batch inserts at the moment, this
     should also be applied to single inserts.

versioning/BRM/slavedbrmnode.h

@@ -364,6 +364,20 @@ public:
     EXPORT int writeVBEntry(VER_t transID, LBID_t lbid, OID_t vbOID,
                             uint32_t vbFBO) throw();
 
+    /** @brief Bulk registers a version buffer entry.
+     *
+     * Similar to writeVBEntry, but registers the version buffer
+     * entries in bulk for a list of lbids and vbFBOs, for a given
+     * transID and vbOID.
+     * @note The version buffer locations must hold the 'copy' lock
+     * first.
+     * @return 0 on success, -1 on error
+     */
+    EXPORT int bulkWriteVBEntry(VER_t transID,
+                                const std::vector<BRM::LBID_t>& lbids,
+                                OID_t vbOID,
+                                const std::vector<uint32_t>& vbFBOs) throw();
+
     /** @brief Atomically prepare to copy data to the version buffer
      *
      * Atomically sets the copy flag on the specified LBID ranges