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.

dbcon/dmlpackage/dmltable.cpp

@@ -72,6 +72,28 @@ int DMLTable::read(messageqcpp::ByteStream& bytestream)
     return retval;
 }
 
+void DMLTable::readMetaData(messageqcpp::ByteStream& bytestream)
+{
+    // read the table name
+    bytestream >> fName;
+
+    // read the schema name
+    bytestream >> fSchema;
+}
+
+void DMLTable::readRowData(messageqcpp::ByteStream& bytestream)
+{
+    messageqcpp::ByteStream::quadbyte rowNum;
+    bytestream >> rowNum;
+
+    for (unsigned int i = 0; i < rowNum; i++)
+    {
+        Row* aRow = new Row();
+        aRow->read(bytestream);
+        fRows.push_back(aRow);
+    }
+}
+
 int DMLTable::write(messageqcpp::ByteStream& bytestream)
 {
     int retval = 1;