Implements feature #47.
Remove all special installation types. There is now only a guided installation, when no parameters are given to the configure.sh script.
The scripts now also accepts a file as parameer, which defines all needed information.
Add function which checks if all needed variables are defined in the input file. Also test if the values are in the allowed range and
if the input file contain unsuported combinations of variables.
Add three example configuration files.
Remove osolete code which belongs to the old shell script version of the system check.
Update README file.
Write config.cache file for any kind of installation.
Remove osolete code which belongs to the old shell script version of the system check.