Fix some string-embedded XML indentation.

Author: kylc

python_examples/ex01_sample.py

@@ -11,12 +11,12 @@
  <root BTCPP_format="4" >
 
      <BehaviorTree ID="MainTree">
-        <Sequence name="root">
-            <AlwaysSuccess/>
-            <SaySomething   message="this works too" />
-            <ThinkWhatToSay text="{the_answer}"/>
-            <SaySomething   message="{the_answer}" />
-        </Sequence>
+         <Sequence name="root">
+             <AlwaysSuccess/>
+             <SaySomething   message="this works too" />
+             <ThinkWhatToSay text="{the_answer}"/>
+             <SaySomething   message="{the_answer}" />
+         </Sequence>
      </BehaviorTree>
 
  </root>

python_examples/ex02_generic_data.py

@@ -12,12 +12,12 @@
  <root BTCPP_format="4" >
 
      <BehaviorTree ID="MainTree">
-        <Sequence name="root">
-            <AlwaysSuccess/>
-            <Rotate    position="[1.0, 0.0]" theta="90."         out="{rotated}" />
-            <Translate position="{rotated}"  offset="[0.1, 0.1]" out="{translated}" />
-            <Print     value="{translated}" />
-        </Sequence>
+         <Sequence name="root">
+             <AlwaysSuccess/>
+             <Rotate    position="[1.0, 0.0]" theta="90."         out="{rotated}" />
+             <Translate position="{rotated}"  offset="[0.1, 0.1]" out="{translated}" />
+             <Print     value="{translated}" />
+         </Sequence>
      </BehaviorTree>
 
  </root>

python_examples/ex04_ros_interop.py

@@ -28,10 +28,10 @@
  <root BTCPP_format="4" >
 
      <BehaviorTree ID="MainTree">
-        <ReactiveSequence name="root">
-            <Print value="{tf}" />
-            <GetRosTransform frame_id="odom" child_frame_id="base_link" tf="{tf}" />
-        </ReactiveSequence>
+         <ReactiveSequence name="root">
+             <Print value="{tf}" />
+             <GetRosTransform frame_id="odom" child_frame_id="base_link" tf="{tf}" />
+         </ReactiveSequence>
      </BehaviorTree>
 
  </root>

python_examples/ex06_async_nodes.py

@@ -21,10 +21,10 @@
  <root BTCPP_format="4" >
 
      <BehaviorTree ID="MainTree">
-        <ReactiveSequence name="root">
-            <Print value="{command}" />
-            <MyAsyncNode start="[0.1, -0.2]" goal="[-0.6, 0.3]" command="{command}" />
-        </ReactiveSequence>
+         <ReactiveSequence name="root">
+             <Print value="{command}" />
+             <MyAsyncNode start="[0.1, -0.2]" goal="[-0.6, 0.3]" command="{command}" />
+         </ReactiveSequence>
      </BehaviorTree>
 
  </root>