EEG: source reconstruction utilities

[DominiqueMakowski]

Some source reconstructions shenanigans.

[codecov-commenter]

Codecov Report

Merging #564 (bbace51) into dev (e2eed3a) will decrease coverage by 0.22%.
The diff coverage is 19.51%.

@@            Coverage Diff             @@
##              dev     #564      +/-   ##
==========================================
- Coverage   83.56%   83.33%   -0.23%     
==========================================
  Files         210      213       +3     
  Lines       10203    10244      +41     
==========================================
+ Hits         8526     8537      +11     
- Misses       1677     1707      +30     

Impacted Files	Coverage Δ
neurokit2/eeg/mne_crop.py	6.12% <ø> (ø)
neurokit2/eeg/eeg_source.py	5.88% <5.88%> (ø)
neurokit2/eeg/eeg_source_extract.py	18.18% <18.18%> (ø)
neurokit2/eeg/mne_templateMRI.py	20.00% <20.00%> (ø)
neurokit2/eeg/__init__.py	100.00% <100.00%> (ø)
neurokit2/signal/signal_fixpeaks.py	97.71% <0.00%> (+0.76%)	⬆️
neurokit2/rsp/rsp_simulate.py	95.53% <0.00%> (+0.89%)	⬆️

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