setup-dump_db-5_0_0.php

<?php
    // Only pertinent if cloning another installation database	
    if ( ! empty($installer->clone_database)) {

      echo "Dumping source database...";
      flush();
      if ( ! $installer->create_dumpfiles() ) {
        echo $installer->error_message;
        break;
      }
      else {
        echo " OK.<br>\n";
        flush();
      }
    }

setup-load_db-5_0_0.php

<?php    
    // Load the database files
    $dump_results = $installer->load_dumpfiles();