rewrite setup_area.sh (import MultiLep commands)

I want to get rid of MultiLep/installscripts/install_script.sh.
Advantages:
- separate the checkout step from the compilation step. We often have
  errors (ssh, kerb auth, etc.) when checking out the
  dependencies. The multilep script doesn't stop, instead it goes on
  trying to compile, and when it failes the original error messages
  are buried in the log. This makes debugging difficult.
- I now have some of the tags of the packages in
  susynt-write/bash/setup_area.sh, others in
  MultiLep/installscripts/install_script.sh, others in
  SUSYTools/python/install.py. Tracking down what we're using is
  difficult. With this modification we have only two places: (1)
  SUSYTools/python/install.py with the SUSYTools dependencies (2)
  susynt-write/bash/setup_area.sh with the EWK dependencies.
- Nobody has committed anything to MultiLep in a long time, and I
  prefer committing my stuff to git.
SUSYTools: 00-03-21 --> 00-03-23
pull in single lep trig
drop suggestion to fix 03-21 (now obsolete)
Merge pull request #2 from gerbaudo/prep-n0155

Prep n0155