[Mne_analysis] Forward model including reference channels

[Jeff Hanna]

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I'd like to simulate raw data from a source model which includes both
cortical sources, as well as a number of focal sources far outside of the
helmet. It's important to be able to project these sources into the MEG
reference channels (Magnes 3600 system), not just the data channels.

I don't see any way to do this outside of messing with some lower level
functions; the question is, which of two routes: 1) designate reference
channels as meg channels - not allowed by .set_channel_types, so hack that,
or 2) hack the various forward modelling private functions. Does anyone
have an intuition which is likely to break the least things?

Best,
Jeff Hanna
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