Simplify trustpath display, view from user's perspective

This update shows trustpaths as A->B->C rather than A->B, B->C, which should close issue #13.

It also has a commit to get the trustpath from the current user's viewpoint if they are logged in, rather than from the node's viewpoint. I am not sure if issue #1 meant to do this, or if the trust viewpoint is more far-reaching than only for the trustpath.