rtabmap.launch.py: fixed wrong relay remap names when compressed is false. Fixed warnings showing the base topic names and not the remap names. Added rtabmap.launch.py usage in example launch files. Install rtabmap.launch.py.

launch/ros2/turtlebot3_scan.launch.py

@@ -2,7 +2,10 @@
 #   Install Turtlebot3 packages
 # Example:
 #   $ ros2 launch turtlebot3_gazebo turtlebot3_world.launch.py
+#
 #   $ ros2 launch rtabmap_ros turtlebot3_scan.launch.py
+#   OR
+#   $ ros2 launch rtabmap_ros rtabmap.launch.py visual_odometry:=false frame_id:=base_footprint subscribe_scan:=true depth:=false approx_sync:=true odom_topic:=/odom args:="-d" use_sim_time:=true
 
 from launch import LaunchDescription
 from launch.actions import DeclareLaunchArgument, SetEnvironmentVariable
@@ -27,8 +30,6 @@ def generate_launch_description():
           ('scan', '/scan')]
 
     return LaunchDescription([
-        # Set env var to print messages to stdout immediately
-        SetEnvironmentVariable('RCUTILS_CONSOLE_STDOUT_LINE_BUFFERED', '1'),
 
         # Launch arguments
         DeclareLaunchArgument(