do_fhem/fhem/core

Prerequisite:
- perl
- stop any existing FHEM process first (if started any).

HOWTO:
Start FHEM with a demo configuration with
perl fhem.pl fhem.cfg.demo
(typed in a terminal) and point your browser to http://YourFhemHost:8083
Use the startfhemDemo skript on the FritzBox.
If you'd like to see the RSS demo, you have to install the Perl GD library,
e.g. with:
sudo apt-get install libgd-gd2-perl
sudo apt-get install libgd-text-perl

Stopping:
- type shutdown in the browser command window, followed by RETURN
or
- type CTRL-C in the terminal window

This demo:
- it won't overwrite any settings in the productive FHEM installation
- it uses its own log-directory (demolog) and configfile (fhem.cfg.demo)
- it won't start in the background, the FHEM-log is written to the terminal
- it won't touch any home-automation hardware (CUL, ZWawe dongle, etc) attached
to the host.