BF: Single coil covariance estimation for preproc pathways.
- Coil covariance estimation is now common across all inputs to
fsl_mrs_preproc
andfsl_mrs_preproc_edit
. - Fallback option to disable coil pre-whitening when it isn't possible to calculate.
fsl_mrs_preproc
and fsl_mrs_preproc_edit
.