Introduce distinct stem face for branching nodes #71
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This is useful for identifying "false-branches", i.e. linear parent->child chains which must (for display purposes only) be moved downward to avoid collisions with other branches in the tree. It also shows at a glance where navigation among various children is possible. By default the face is simply a bold version of the normal stem face; customize `vundo-stem-branch' face to change.
See #64 for discussion and development of the ideas, along with several images.