Reorganization of repository

These request reorganizes the repository to work nicely with a FCCSW checkout from github.

It removes the own copy of FCCSW and places all files in the root of the repo, so after checking out out Gaudi, FCCSW and FCCSW-hh the directory will look like this

./Gaudi
./FCCSW
./FCCSW-hh

The Readme.md was updates to reflect this change.

By the way: The instructions in Readme.Install do _not_ work properly due to some permission issues in Benedikts work directory.

cheers
Daniel