V2.0.0 new option --xpra-attach, some short options changed, bugfixes
V2.0.0 new option --xpra-attach, some short options changed, bugfixes

# 24.02.2017 V 2.0.0  bugfix: xpra crashes on debian 9, leaving black screen. See debian bug 855980
#                     version check for xpra on option --xpra-attach
# 23.02.2017          created x11docker-install.sh
# 21.02.2017          changed onlyX to Xonly
#                     merged pull request #6 / avoid docker bug in createuser
#                     new option --xpra-attach: Use xpra server in image
#                     changed --X11 to --xorg
# 20.02.2017          --auto: don't autochoose xpra or Xephyr on tty1-6
#                     minor bugfix: only call xrandr if DISPLAY is set (Xaxis/Yaxis)
#                     changed many shortopts
#                     easier setup of Xwrapper.config
#                     minor bugfix: avoid window manager grep error with Hostdisplay fallback
mviereck/x11docker