v1.13.0

Features

• Frequencies are now displayed via a stream graph panel - see PR 497.
  These require the fetching of a separate tip-frequencies JSON, and must be specified in the panels array of the meta.JSON.
• "Panels To Display" toggles in the sidebar allow customisation of the display, and this is reflected in the URL.
• The + - buttons in the tree have been replaced by a "reset tree" button.
  This resets the bounds to the entire tree & completely re-renders the tree (filters are maintained).
  Pan behaviour is unchanged.

Internals

• React-PhyloTree interface is completely rewritten to use phylotree.change() - see PR 501 for the API.
  The new interface is both easier to understand and quicker.
• changePageQuery (used for changing narrative blocks) is now a single action
• Ongoing narrative work (still disabled).
• React sidebar has been removed (no UI changes).