Commit 60 (Beta Candidate)

- Many changes and improvements to JsViews.com SPA site -
  including providing full independent scrolling support
  for both the right-hand topic pane and the left hand
  TOC navigation pane.

- New support for URL and history links referencing
  anchored locations within (scrolled) topics - with
  animated scrolling to the targetted anchor.

- Some bug fixes for childTags() API when in element-only
  content.

- Additional work on data-linking with deep paths and
  using "onerror" - plus memory leak bug fix, for scenarios
  called out in:
  https://github.com/BorisMoore/jsviews/issues/281

- Some additional bug fixes.

- Many new unit tests added.