Add pr2_msgs/GPUStatus to pr2_msgs for Diamondback (ros ticket #4958)

[ahendrix]

This message allows us to have machine readable debugging of an NVIDIA Quadro 600 GPU.

See review here: http://www.ros.org/wiki/pr2_msgs/Reviews/2011-1-11%20GPU%20Status%20MSG%20API%20Review

trac data:

• Owner: watts
• Reporter: watts
• Reported at: Tue Jan 11 11:25:30 2011
• URL: https://code.ros.org/trac/wg-ros-pkg/ticket/4958

[ahendrix]

[watts] Committed first draft to pr2_msgs trunk, r47881. Waiting on review.

[ahendrix]

[watts] r47890 - Fan speed in Hz

[ahendrix]

[watts] r47893 - Numeric fields are now in floats thanks to review.

Message is committed and we're OK for Diamondback.