MNE sEEG example

The MNE sEEG example has many issues which I first brought up here

• bad channels are not marked
• no referencing has been done? Or is the raw data already bipolar referenced? In any case, this info is missing from the tutorial
• some of the shafts are in the “air”
• the stc.plot_3d function gives the incorrect idea that there are lots of active regions in the brain. See comment linked above for alternative viz and also #8382 as point out by @larsoner
• it’s too verbose about transformations. I think it’s just an identity transformation usually.
• information about what task etc is missing. I think we shouldn’t be plotting “something” just for the sake of plotting. There should be some neuroscience motivation at least 😃

cc @adam2392 perhaps you have time to improve this? 😃

[choldgraf]

[drammock]

@adam2392 edits to your sequence:

• step 2 requires permissions on our OSF account, so either we can grant you that or one of the other devs can upload it.
• Step 5 is slightly more complicated in that it the dataset fetching code is under revision (see #8679) but basically yeah, it involves adapting a data_path() function to work with bst_epileptogenicity.
• Steps 3 & 5 should happen at the same time (same PR).
• Step 4 would come after the combined step 3+5 (i.e., could be a subsequent PR) although presumably you would want to do the code changes for it early on to make sure the converted dataset looks the way you expect it to, before bothering to do the upload & other steps.