6.0 Release -- first in a long time, fix some bugs, add Wolfi support

• usr/lib/byobu/disk:
  • drop the -P from df which is breaking MacOS
    not sure where this came from
• byobu.txt, usr/bin/whats-my-public-ip,
  usr/share/byobu/pixmaps/byobu_backup.svg:
  • copy over a couple of missing changes from bzr to git
• debian/control, debian/copyright, README.md, usr/bin/byobu-
  export.in, usr/share/man/man1/byobu-export.1:
  • moving upstream Byobu from Launchpad.net to Github.com
• README.md:
  • bumped date
• usr/bin/byobu-select-profile.in: LP: #1828296
  • add missing listprofiles logic
• usr/lib/byobu/include/select-session.py:
  • fix inverted logic on session reuse
• usr/lib/byobu/logo:
  • added a logo for Wolfi
• usr/lib/byobu/include/shutil, usr/lib/byobu/release:
  • Wolfi doesn't really have versions, so just use the distro
    name rather than version id