Add configure script

version beta!

update issue #3
update issue #4

Add a script to simplify the first configuration.
- create the hpcname file containing the front-end hostname variable
- admins can choose which modules to install for the machine (create
  symlink automatically)

Possible Enhancement:

- save current config in a file .$HPCNAME.cfg for example.
- edit the previous saved config.
- add the step 3, i.e create the cluster config file with all path in
  /etc/feelpp.d in function of the module choosen.