automate some overlapping identifier tests
dont draw the lime green bubbles for imported identifiers

One problem with commit 299063d7c154428d000eb436aae4320b5781b15b
is that the new method for computing the lime green arrows no
longer has the information necessary to distinguish different
identifiers that come from the same require.

This means that, before this commit, mousing over an imported
identifier can be a real interactivity killer. So, instead of
adding more information to distinguish those ids, lets just
try not draw the lime green bubbles for imported identifiers
and see how that feels