HMS change, to simplify setup on compliant platforms (i.e. those using bash 4.x).
The shebang line for all bash scripts has been standardized to /bin/bash, and
bash checks for $BASH_VERSION added where needed. References to having a
custom-built /usr/local/bin/bash have been removed.
As a trade-off, non-compliant platforms (way-old Linux and Mac using bash 3.x) will
have a bit more work to do to work with shebang lines.