These changes are required for Edwin version 3.79. Older versions of

These changes are required for Edwin version 3.79.  Older versions of
Edwin will still work with this microcode.

* Change "map" argument to window creation primitives so that it can
  specify the resource names _and_ not to map the window.  Previously
  specifying the resource names forced mapping.

* Change the X-DEBUG primitive to accept non-negative fixnums to allow
  the amount of debugging information to be set.  #f and #t are still
  accepted, meaning the same as 0 and 1, respectively.

* Extend "expose" objects with another element that identifies each
  one as either an Expose event or a GraphicsExpose event.

* Implement new primitive X-WINDOW-FLUSH.