[HER-1546] Springify(5): Update checkpointing to work smoothly with spring-configured crawls

* profile-crawler-beans.cxml*2, migrate-template-crawler-beans.cxml
    add CheckpointService as recommended bean

engine/src/main/java/org/archive/crawler/restlet/profile-crawler-beans.cxml

@@ -400,6 +400,13 @@ http://example.example/example
   <!-- <property name="maxTimeSeconds" value="0" /> -->
  </bean>
  
+ <!-- CHECKPOINTSERVICE: checkpointing assistance -->
+ <bean id="checkpointService" 
+   class="org.archive.crawler.framework.CheckpointService">
+  <!-- <property name="checkpointIntervalMinutes" value="-1"/> -->
+  <!-- <property name="checkpointsDir" value="checkpoints"/> -->
+ </bean>
+ 
  <!-- 
    OPTIONAL BEANS
     Uncomment and expand as needed, or if non-default alternate