ENH: symmetrization of input signal before STC
experimental module for LLR (Local Linear Regression)
FEATURE: fit/transform API for nisl and nilearn, implemented in class STC
REFACTOR + BUGFIXES: all STC-related code centralized into well-documented STC class
ENH: plot_slicetiming_results(..) can now be used to compare results from different STC implementations (e.g ours versus SPM)
REFACTOR