* sly.el (sly-flash-region): Accept optional `face' arg.

* sly-fancy.el (sly-fancy): Activate `sly-stickers' by default.

* sly-stickers.el (sly-stickers): Name contrib `sly-stickers', not sticker.
(sly-parse): Require `sly-parse'
(sly-stickers-clear-defun-stickers, sly-stickers-dwim)
(sly-stickers--stickers-at-point): New functions.

* slynk-trace-dialog.lisp (instrument): Just error when setf expanding.