multiple requests (ros-pkg ticket #5472)

[dirk-thomas]

From @tfoote on January 31, 2013 19:25

ServiceCaller plugin:

• add requests to a list (like in the Publisher)
• call them "on click"/"on context menu"
• persist/restore list of requests with their expressions
• show response below list of request to reduce horizontal space consumption

trac data:

• Owner: dorianscholz
• Reporter: dthomas
• Reported at: Wed Jun 20 19:35:21 2012
• URL: https://code.ros.org/trac/ros-pkg/ticket/5472

Copied from original issue: ros-visualization/rqt_common_plugins#28