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Kinetic migration

See merge request !1

# Conflicts:
#   src/safe_cmd_alg_node.cpp

Added modes: front_rear, original independent front/rear laserscan usage, frame_check, new mode where laserscans are transformed to base_frame pointclouds, and its points are used separately for front o rear speed limit
Added unsafe joy button, where a defined joy button enables unsafe mode while pressed

 - start watchdog on constructor, so ERROR msgs show if lasers don't work from the start
 - using ROS_ERROR_DELAYED_THROTTLED, with period of 5 seconds, which waits first 5 seconds before showing first error message.

El threshold no funcionava. Provo de fer una funcio que calculi el minim intentant evitar els valors <= 0.005

separat missatge lasers en 2 i afegit debug stream per veure possibles espuris[1] dels lasers. [1] Pregunteu a l'angel si no enteneu el significat

- optimitzada funcio de calcul maxim vel
- manicura de codi (usar _ enlloc de this-> ...)
- Testejat amb simulacio teo_sim

 - added parameters for variables
 - if a scan is not received, outputs an error (but keeps working)

 - Changing wrong msgs dependency template <msg_package_name>_cpp to <msg_package_name>_generate_messages_cpp

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Saturation to max front and rear velocities computed from distance to closer obstacle. Also relative motion command from teleop.

IRI SAFE CMD: filter cmd_vel depending on Laser Scans, so the robot stops moving to a close object. To be used with teleop or non-OA navigation