fPrep: Preprocessing of fMRI data.

This version adds scripts to transform anatomical images, apply smoothing and filtering to functional images, and some minor maintenance-related changes.

Features:

• Transformation of anatomical images to functional space using transform_anat2func.py
• Smoothing and temporal filtering of functional images using smooth_susan

Fixes/improvements:

• Updated and streamlined build configuration
• Use scikit-learn dependency instead of deprecated sklearn