added cardinal- and ordinal- versions of neighbors-do
use W and H for show so I can change the grid size
replaced inform-neighbors with hints-create
refactored flood to use cardinal-neighbors-do, and corrected logic for when to keep going
refactoring cell display, step 1: extract the mess of quotes
refactoring cell display, step 2: align steps horizontally, replace flags with inline calls to in-brackets / no-brackets
refactoring: dropped the per-cell hint bit and associated drawing routine, since this is same as being uncovered. instead, always show the hint for uncovered squares, but show spaces instead of zeros. also created 'allHints?' variable to preserve ability to see hints for debugging.