Called if slicetiming option is set.
Attempts to load slice timing infomation. This will not always succeed.
Read Used for slice timing corrections and physiology. This is called before loading physiology, since the info can be used to get slice-by-slice timetrends.
For each fMRI series, read slice timing, looking in this order:
A file named “slicetiming.txt” in the rawimages series folder
BIDS slice timing information
DICOM headers
For info about slice timing, see fMRI Slice Timing.
Check that TR from slice timing matches fmritype TR (gives warning if not)
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