lxroot now exports FAKEROOTDONTTRYCHOWN=1. (This allows fakeroot and apt-get.)
With -x, added various X display sanity checks and error messages.
With -x, lxroot will test the X display connection by running 'xset -q'.
In a terminal with -x, lxroot will prompt to copy in ~/.Xauthority.
In a terminal with -n, lxroot will prompt to copy in /etc/resolv.conf.
In aux/unit.sh, added interactive tests of above prompts.
In str.cpp, wrote new Str class. (Removed old Str and Frag classes.)
In str.cpp, rewrote string concatenation.
In Makefile, removed demo3. (vland obsoletes demo3.)