[NUIT-93] Add cle-use-sim-time alias to set use_sim_time ROS parameter during cle-start.

Add the cle-use-sim-time alias to set use_sim_time ROS parameter during cle-start, right after roscore.

In fact, use_sim_time must be set before any other ROS node is started in order to instruct them to use simulated time (gazebo-published “/clock“ messages) instead of wall clock time.

Refer to https://bitbucket.org/hbpneurorobotics/cle/pull-requests/90/nuit-93-fix-synch-issues-between-tfs-and for instruction on how to test.

CHANGES:

• Add cle-use-sim-time alias to set use_sim_time ROS parameter during cle-start, right after roscore. In fact, use_sim_time must be set before any other ROS node is started.

• Rename killlist to kill_list

• Add some quoting to prevent word splitting with spaces