v0.7.0: the next (or prev) release

new features

• added a few more helper methods to *booklit.Section which can be useful
  when templating:

  • NextSibling: returns the next sibling section, if any

  • Next: returns the first sub-section, if any, or the NextSibling

  • Prev: returns the previous sibling section, if any, or the parent section

  these are mainly in service of generating 'next/prev' links at the end of a
  section in order to guide the reader along to the rest of the content, in
  situations where the nav is separate and would be hard to notice