Peak Index Grouping Issue

[ibiglari]

https://github.com/afeinstein20/stella/blob/f9ffd78d1c7279012e870f3657812595f18eee74/stella/mark_flares.py#L92C1-L92C33

If groups are not of the same size, this line will cause an exception.

Let's say peaks are detected at tpeak=[100, 150, 151, 152, 191, 192].

This function will try to group them into [[100], [150, 151, 152], [191,192]] and then return this as a two dimensional array, instead of array of arrays, leading to a crash.

[github-actions[bot]]

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