Meggie

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- Fix problem with a regexp in save_raw.

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- Fix group averages for multiple groups
- Fix tse plot units with no-mean baseline correction

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- Fix save_raw for long recordings with split files

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- Make meggie consistent across induced response channel averages: baseline is corrected to before averaging over channels
- Pin matplotlib==3.7.3 as newer matplotlibs are not compatible with pinned mne==1.3.1
- Fix bug where saving TFR's resulted in csv file for each subject even though there should be only one file with all subjects' data in.

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- Fix error that happened when saving TFR without baselining

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- Allow selecting multiple channels for rereferencing