ENH: More verbose error message

[larsoner]

I always forget how to submit bug reports to OpenNeuro. So to save myself some effort next time, turn this error message:

E   RuntimeError: Error 404 when trying to download /home/larsoner/mne_data/ds000248/derivatives/freesurfer/subjects/fsaverage/label/Yeo_Brainmap_fsaverage_README from https://s3.amazonaws.com/openneuro.org/ds000248/derivatives/freesurfer/subjects/fsaverage/label/Yeo_Brainmap_fsaverage_README?versionId=WuMze1X4S_cLoRCbEs5IpCIOJMe2VT41

Into this:

RuntimeError: Error 404 when trying to download /home/larsoner/mne_data/ds000248/derivatives/freesurfer/subjects/fsaverage/label/lh.BA1_exvivo.label. If this is unexpected:
E   
E   1. Navigate to https://openneuro.org/crn/graphql
E   2. Enter and run the operation: query { snapshot(datasetId: "ds000248" , tag: "1.2.4" ) { id files(tree: "4051a693617af344e8498593d4bf4cb258f341bd" ) { filename urls size directory id } } }
E   3. In the Response, try to manually download the "urls" for "Yeo_Brainmap_fsaverage_README", which should contain https://s3.amazonaws.com/openneuro.org/ds000248/derivatives/freesurfer/subjects/fsaverage/label/Yeo_Brainmap_fsaverage_README?versionId=WuMze1X4S_cLoRCbEs5IpCIOJMe2VT41
E   
E   If the download fails, open a GitHub issue like https://github.com/OpenNeuroOrg/openneuro/issues/3145

And used it to open OpenNeuroOrg/openneuro#3145

[larsoner]

@hoechenberger if no objections I'll go ahead and merge

[hoechenberger]

thanks Eric!!

[larsoner]

Might be worth cutting a quick release, in mne-bids-pipeline I'm going to install from source to get this PR's error message so I can open an openneuro issue