document, and add Show instance
Parser for bordered rectangles.
Parse tight fit grid
Allow '-' for Blank.

This is so Either Blank Int works for parsing the skyscraper
clues in my puzzles.
Fix the skyscraper tests.

Changed the positive test to a valid puzzle, and based the
broken tests on that one.
enable tightfit tests
Test size of parsed tightfit grid.
Fix size calculation for bordered grid.
Add test for outside clues.
Fix outside clue orientation (flip vertically)
get rid of readEdges'
convert wordsearch to parser style
convert latintapa and sudoku
parsing spaced grids
reading wide clue grids
convert fillomino
parse shaded grid
convert nurikabe
convert wordloop
Plain grid parsing.