Fixed the broken compiler.

Was confounding input script to the interpreter with the output script
from the compiler.
Clean up some issues with the compiler.

The compiler no longer creates the component objects. It just sets the
numbers of targets, sounds, etc. to the nominal values. If needed, we
will add a way to change those numbers in the command line.

Also added the data and time to the header of the compiled scripts.

Finally, I removed the automatic insertion of commands to set the
targets and tones off, since DEX does those automatically.
Cancelling force sensor offsets.

Cancelling force sensor offsets should be considered to be a separate
task for the DEX implementation, with its own script.
We add here the -raz command line option to allow one to include it at
the start of a task in simulator mode.