0.4.1_6.0.1

This release has one change

• Update the Dockerfile to use FROM ubuntu:xenial instead of FROM ubuntu:trusty
• Ensures that Python 2.7.12 is used instead of Python 2.7.6
• Gives Freesurfer recon-all the python urllib3 (1.25.9) and requests (2.23.0) packages that works with Flywheel >= v12.0.0
• All top level files are shown to be exactly the same (md5 hash)
• Differences in the archive are primarily due to datestring differences between runs