Bugfix: Now the number of Gaussians of the mixture model can be >1 again.
- Fixed bug in mixture modelling: Outliers were just determined from the cluster that represents the approximately normally distributed tissue and did not include samples from other clusters. Now the T2*w/T1w means are determined by get_antissue(), which are used as the reference in get_outliers() for deriving the robust distances with all T2*w/T1w intensity pairs of a ROI.
- Bland-Altman plot includes regression line from polyfit()