Bash scripts: introduced a new function to check dependencies.This function is used by setup.sh to ensure that git, make, etc. are available.
README.txt updated; all Copyright notes updated to 2019
fixed an issue in the GCC script (realpath failed)
gccsetup.sh: initially suggested link directory has been enhanced (now one up from installation directory); link paths are now relative
moved the compier/ and ide/ folders to a common folder tools/