Fix fsdb.sh

Previously using utils.open and writing the file to the wrong directory.
Use get_filename for .flist.
Fix WAVE option.

Previously used a list instead of the string.
Fix get_env_variable

Turns out the module load command won’t work directly from Python.
Needed to use a combination of os.popen and exec.
Always print Launching.
Change modules for VCS & Verdi.
Add more things to do.