This version is able to be put in place of displayMgr.

The command line that starts displayMgr is:
/home/root/start.sh:/usr/bin/displayMgr -p &
The -p flag indicates "don't do partial updates" (although we will ignore that).

DisplayMgr is started before the Xserver, so
- We will have to wait for a displayMgr upd packet before
  opening the display

Added:
- The --debug command-line flag (now xepdmgr is quiet by default)

