Introduction
======================
The primary goal of this patch is to create the notion of a
"config-relative" path reference.  For example, a configuration file
"/etc/foo/bar.yaml" that contains a key "bat" with a value
"baz/blaz/blamo" can be used to specify that "baz/blaz/blamo" should
be considered relative to the configuration file itself.  In this case,
it would be expected to be found at /etc/foo/baz/blaz/blamo.  FAB-2037
does a much more thorough job of explaining the rationale on why
config-relative is considered important/good-form.

This is in stark contrast to what we have today, which is a jumbled
mess of assumed GOPATH relative, CWD relative, ENVVAR absolute and
sometimes even ENVVAR relative.  Therefore, an additional positive
side-effect of this endeavor is that this patch also substantially
cleans up some technical debt that had been accumulating in the tree
for some time related to ad-hoc pathing, DRY violations, and just
general inconsi...