execute a whole script

[nim65s]

Hi,

@olivier-stasse suggested that we should allow an user to send a whole python script, instead of just a single python command with the run_command ROS topic.

This would avoid users to try to manually parse a python script to send it line by line.

ref stack-of-tasks/talos_integration_tests#2

[jmirabel]

This used to be possible in the past. You may dig into git logs.

The thing which was troublesome is the fact that the file must be specified from the server cwd, on the server computer. On the robot, this was sometimes misleading.

[jmirabel]

So maybe we should precise whether we want to be able to send the file content or the filename.

[MaximilienNaveau]

Oo right!
Sending the file content would be much easier for the user.
We could have just one run_command which locally parse a file in case the input string is a valid file.