To become independent from the FairRoot macros and scripts, simply add the
needed macros in cmake/modules and input needed to generate the scripts
into cmake/scripts.
Change copied macros such that the input needed to generate the scripts is
taken from the local cmake/scripts directory.
Use macros and configuration input from local cmake directory.
Fix problem with removing the existing PATH and LD_LIBRARY_PATH variables when sourcing the config script without additional parameter.
