driver comedi_simple: correctly handle new comedi module 0.10.2

The new python module comedi already has the function names without the comedi_*.
So we don't need to handle this anymore, just the error codes.
With such version, calling the comedi* functions will not work.

Also improve exception message.
Also improve the wrappers to not depend on partial (make the calls slightly faster).

It should also be compatible with the older module versions.
acq stream: improve comment
driver pigcs: add note about need to turn off the servo on timeout with CL
Merge branch 'master' of vpn.delmic.com:odemis
acq stream: put back code dropped during merge

Apparently something went wrong when Rinze merge the new spectrum 1D code.
Put it back.
Exception due to wrong VA assignment fixed
Minor change
Merge branch 'master' of delmic-server.local:odemis