Added an install script for StarSs_testing. Builds from
given commit in text git repository for Laki or Hermit.
Usage:
GIT_COMMIT=xyz TARGET=laki|hermit ./StarSs_testing_install.sh
Note: On hermit ther is no access to git repository, so need
to do the first couple of steps offline and copy the tar file
into the $WORK_DIR.
