- References to headers now involve the package names.

- The zpkg support files have been moved to the top-level directory,
  and the releases/ tree has been removed.  The resource map and
  configuration file have been combined now that zpkg allows that.

- The scripts are now all located in src/scripts/ in a checkout.

- Scripts that were imported in the tests have been split into library
  and script components; the library portions share name of the
  script (in order to reduce changes).  The library portions may not
  be used as scripts directly.