kw_globals SCRIPT_BASE_DIR should be computed within the module

[keithstellyes]

Right now, the executable program is responsible for setting the SCRIPT_BASE_DIR by computing it, however instead of needing to compute it we could simply have, in the kw_globals, and the executable would only need to worry about including the kw_globals so the environment for scripts and such is set

# kw_globals.py
SCRIPT_BASE_DIR = os.path.abspath(os.path.dirname(__file__))
if SCRIPT_BASE_DIR not in os.path:
    os.path.append(SCRIPT_BASE_DIR)