Register Machines: a code path is accepted on its file name alone #318

Register Machines (Find, and a typed path) accepts any executable whose name matches the code. On one machine the path 'orca' resolved to /usr/bin/orca, the GNOME screen reader, so a job started the screen reader instead of ORCA. Since 9.1.0 the job script refuses that particular file with a message, but the general gap remains.

Proposal: check each code's identity with a harmless command (for example orca --version, or the program's banner) in Find, plus a Check button next to the path that reports what was found.

Planned for 9.2.0.