[plt-scheme] 299.16

The v299-tagged code in CVS for MzScheme and MrEd is now version 299.16.

Changes:

 * Added `hide-cursor-until-moved' to MrEd, and changed text%'s `on-char'
   to call `hide-cursor-until-moved'.

 * X: improved performance of bitmap scaling when RENDER is available.

 * Changed `syntax-local-certify' to `syntax-local-certifier'.

 * Inside MzScheme: added scheme_set_type_printer(), scheme_print_bytes(),
   and scheme_print_string().

Slideshow has also changed. The "run.ss" module is now synonym for
"slideshow.ss", and the slide-viewing window is opened when the first
slide is registered using `slide' (or one of its variants).

Temporary docs are in the usual place:

  http://www.cs.utah.edu/~mflatt/tmp/mzscheme-doc.plt
  http://www.cs.utah.edu/~mflatt/tmp/mzlib-doc.plt
  http://www.cs.utah.edu/~mflatt/tmp/mred-doc.plt
  http://www.cs.utah.edu/~mflatt/tmp/insidemz-doc.plt

Matthew