final changes before 5.2.2 release
cleared 5.2.2 changes out of changes_to_master
Merge branch 'master' into for_5.2.2
Final changes from 5.2.2 release combined with improvements by @ketch

* master:
  Link directly to full TOC, with condensed one at top.
  Add link to notebook on limiters.
  Update Clawpack5x.md
  Simplify top-level table of contents.
  Cleanup of some TOCs.
  Merge PyClaw developer docs with Clawpack developer docs.
fix link to book.html
updated book links
Merge pull request #74 from rjleveque/for_5.2.2

For 5.2.2