Called if slicetiming option is set.
Attempts to load slice timing infomation. This will not always succeed.
Read slice timing, looking in this order:
A file named “slicetiming.txt” in the rawimages series folder
BIDS slice timing information
DICOM headers
Check that TR from slice timing matches fmritype TR (gives warning if not)
Check that number of slices from slice timing match the size of the fMRI scans (gives warning if not)
Matlab files: cspm_analysis_fmri_slicetiming_load, which calls cspm_mri_getslicetiming