* Editor: Fix crash when quantitizing notes. Bug
  introduced in 6.9.80.
* Windows32: Fix import MOD.
* Macos: Open Help windows in an external browser
  since the manual now uses javascript-features not
  supported by QtWebkit 5.9.
* Manual: Include search field + various other
  improvements.
* Faust: Fix possible performance problem for the
  interpreter backend.
* API:
  * gui_web: Handle local files with queries.
  * gui_web: Only accept Escape key if currently
    searching. (Previously it hindered all other
    usage of the Escape key by web pages.)