Global call graph test

[mpharrigan]

This PR has two commits

First, I add a dev_tool module for making one big call graph. This can be a useful starting point for querying other properties and idiosyncrasies of the bloq library; but here I use it to add a test that all bloq examples have a valid call graph.

Then, I make two minor fixes revealed by running the "all call graph" test.

[mpharrigan]

I brought this up to speed. @tanujkhattar if you could PTAL I think this would be a decent slow test; and it's generally useful to have a script example for making a unified call graph