message: demo_robot_mapping.launch: limited proximity link length and number
diff: <param name="RGBD/OptimizeFromGraphEnd" type="string" value="false"/> <!-- Optimize graph from initial node so /map -> /odom transform will be generated -->
  <param name="Reg/Force3DoF" type="string" value="true"/>
  <param name="Grid/FromDepth" type="string" value="false"/>
  + <param name="Mem/STMSize" type="string" value="30"/> <!--increased to 30 to avoid adding too many loop closures on just seen locations -->
  + <param name="RGBD/LocalRadius" type="string" value="5"/> <!--limit length of proximity detections -->
  <!-- localization mode -->
  <param if="$(arg localization)" name="Mem/IncrementalMemory" type="string" value="false"/>
  