[TAP] Make the DBConnection _protected_ instead of _private_ in ADQLExecutor.

src/tap/ADQLExecutor.java

@@ -105,7 +105,7 @@ import uws.service.log.UWSLog.LogLevel;
  * </p>
  *
  * @author Gr&eacute;gory Mantelet (CDS;ARI)
- * @version 2.3 (03/2019)
+ * @version 2.4 (10/2020)
  */
 public class ADQLExecutor {
 
@@ -130,12 +130,12 @@ public class ADQLExecutor {
 
 	/** Connection to the "database".
 	 * <i>Note: This attribute is NULL before and after the query processing (= call of a start(...) function).</i> */
-	private DBConnection dbConn = null;
+	protected DBConnection dbConn = null;
 	/** ID of the current query processing step (uploading, parsing, execution, writing result, ...).
 	 * <i>Note: This attribute is NULL before and after the query processing (= call of a start(...) function).</i> */
-	private ExecutionProgression progression = null;
+	protected ExecutionProgression progression = null;
 	/** Date/Time at which the current query processing step has started. */
-	private long startStep = -1;
+	protected long startStep = -1;
 
 	/**
 	 * Build an {@link ADQLExecutor}.