demod_tod updates aman.signal #1336
Description
Found this while trying to make a little demod example.
The only difference between the "before demod" and "after demod" in the below plot is that I have run demod_tod( aman ) on the axismanager.
At a minimum right now demod_tod does not include anything in the doc strings about updating or changing aman.signal and that should be added in.
It would also be good to include an option for passing in a different ndarray or copying signal. I see the TypeError catch for passing in an ndarray but this could be handled by temporarily adding the ndarray to the axismanager.
