Double k_velocity value for PR2 head tilt joint (ros ticket #5075)

[ahendrix]

If we can double the k_velocity safely, then we can lift a PR2 head with a Kinect installed.

trac data:

• Owner: wim
• Reporter: watts
• Reported at: Tue Mar 15 13:21:06 2011
• URL: https://code.ros.org/trac/wg-ros-pkg/ticket/5075

[ahendrix]

[watts] I did this a while ago in r53285.