Added external table engines support.

h2/src/main/org/h2/command/Parser.java

@@ -4789,7 +4789,7 @@ public class Parser {
             }
         }
         if (readIf("ENGINE")) {
-            command.setTableEngine(readString());
+            command.setTableEngine(readUniqueIdentifier());
         }
         if (temp) {
             if (readIf("ON")) {

h2/src/main/org/h2/table/TableBase.java

@@ -64,9 +64,9 @@ public abstract class TableBase extends Table {
         }
         buff.append("\n)");
         if (tableEngine != null) {
-            buff.append("\nENGINE '");
+            buff.append("\nENGINE \"");
             buff.append(tableEngine);
-            buff.append("'");
+            buff.append("\"");
         }
         if (!isPersistIndexes() && !isPersistData()) {
             buff.append("\nNOT PERSISTENT");