Alpha Version 6

This release has an issue with wireless

• Updated to kernel version 4.17.19
• Add firefox from buster as the version in stretch is broken
• Add trim and other fstab features
• Improve install reliability
• Have user set root password
• Fixed the audio mixer in lxqt
• package in source-code-pro font for spacemacs

With contributions from @JeremyRand to improve support for buster

Known issues

• firefox doesn't output sound.
  You can install chromium from unstable, which does output sound by running
  sudo apt -t unstable install chromium