A set of small fixes #53

Job	Run time
check-paths	7s
pythonpackage	3m 33s
build_cpp_extensions (rcs_robotics_library)	3m 31s
build_cpp_extensions (rcs_fr3)	3m 53s
build_cpp_extensions (rcs_so101)	4m 49s
build_cpp_extensions (rcs_panda)	3m 19s
build_extensions (rcs_xarm7)	2m 48s
build_extensions (rcs_realsense)	2m 58s
build_extensions (rcs_usb_cam)	2m 36s
build_extensions (rcs_tacto)	2m 52s
	30m 26s

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