* The build can't descend into external submodules when there is no
configure/RULES_TOP file present in $(INSTALL_LOCATION).
* Recreate modules/RELEASE.<host>.local if configure/CONFIG_SITE or
configure/CONFIG_SITE.local have changed.
* Move the distclean of modules/RELEASE.<host>.local to RULES_TOP
* Several comment and white-space changes
Instead of displaying the failures from each submodule at the end
of testing that submodule, RULES_TOP suppresses the output when
it detects a parent module, and RULES_MODULES adds the children's
failure lists into the parent's list so they all get shown at the
end of the tests/results.
