Updated launch files

launch/tiago_play_motion_bt_client.launch

 <?xml version="1.0" encoding="UTF-8"?>
 <launch>
-
+  <arg name="node_name" 	 default="tiago_play_motion_client" />
+  <arg name="output" 		 default="screen" />
+  <arg name="launch_prefix" 	 default="" />
   <arg name="tree_path"          default="$(find tiago_play_motion_module)/src/xml" />
   <arg name="tree_file"          default="bt_test" />
   <arg name="bt_client_rate"     default="10" />
 
   <!-- launch the play motion client node -->
-  <node name="tiago_play_motion_client"
+  <node name="$(arg node_name)"
         pkg="tiago_play_motion_module"
         type="tiago_play_motion_bt_client"
-        output="screen"
+        output="$(arg output)"
+        launch-prefix="$(arg launch_prefix)"
         ns="/tiago">
     <remap from="~/tiago_play_motion_module/play_motion"
              to="/play_motion"/>

launch/tiago_play_motion_bt_client_sim.launch

 <?xml version="1.0" encoding="UTF-8"?>
 <launch>
-
+  <arg name="node_name" 	 default="tiago_play_motion_client" />
+  <arg name="output" 	 	 default="screen" />
+  <arg name="launch_prefix" 	 default="" />
   <arg name="tree_path"          default="$(find tiago_play_motion_module)/src/xml" />
   <arg name="tree_file"          default="bt_test" />
   <arg name="bt_client_rate"     default="10" />
@@ -11,9 +13,12 @@
   </include>
 
   <include file="$(find tiago_play_motion_module)/launch/tiago_play_motion_bt_client.launch">
-    <arg name="tree_path"       value="$(arg tree_path)"/>
-    <arg name="tree_file"       value="$(arg tree_file)"/>
-    <arg name="bt_client_rate"  value="$(arg bt_client_rate)"/>
+    <arg name="node_name"                  value="$(arg node_name)" />
+    <arg name="output"                     value="$(arg output)" />
+    <arg name="launch_prefix"              value="$(arg launch_prefix)" />
+    <arg name="tree_path"       	   value="$(arg tree_path)"/>
+    <arg name="tree_file"       	   value="$(arg tree_file)"/>
+    <arg name="bt_client_rate"  	   value="$(arg bt_client_rate)"/>
   </include>
 
 </launch>

launch/tiago_play_motion_client.launch

 <?xml version="1.0" encoding="UTF-8"?>
 <launch>
+  <arg name="node_name" 	 default="tiago_play_motion_client" />
+  <arg name="output" 	 	 default="screen" />
+  <arg name="launch_prefix" 	 default="" />
 
   <!-- launch the play motion client node -->
-  <node name="tiago_play_motion_client"
+  <node name="$(arg node_name)"
         pkg="tiago_play_motion_module"
         type="tiago_play_motion_client"
-        output="screen"
+        output="$(arg output)"
+        launch-prefix="$(arg launch_prefix)"
         ns="/tiago">
     <remap from="~/play_motion_module/play_motion"
              to="/play_motion"/>

launch/tiago_play_motion_client_sim.launch

 <?xml version="1.0" encoding="UTF-8"?>
 <launch>
+  <arg name="node_name" 	 default="tiago_play_motion_client" />
+  <arg name="output" 	 	 default="screen" />
+  <arg name="launch_prefix" 	 default="" />
 
   <include file="$(find tiago_gazebo)/launch/tiago_gazebo.launch">
     <arg name="public_sim" value="true" />
     <arg name="robot" value="steel" />
   </include>
 
-  <include file="$(find tiago_play_motion_module)/launch/tiago_play_motion_client.launch"/>
+  <include file="$(find tiago_play_motion_module)/launch/tiago_play_motion_client.launch">
+    <arg name="node_name"                  value="$(arg node_name)" />
+    <arg name="output"                     value="$(arg output)" />
+    <arg name="launch_prefix"              value="$(arg launch_prefix)" />
+  </include>
 
 </launch>