db637a1 - Fix some complaints when you eval the code.
bb26b78 - Make some defvars into defconsts.
728ef33 - move some stuff around to shut up flycheck.
20bc668 - update copyright dates.
c55de92 - start making minesweeper-mode derive from special-mode
1462844 - fixed two bugs: use 'is-mine properly; move mismarked-overlay properly
dd57f86 - use 'is-mine
7ecfbea - add minesweeper-is-mine, start using it.
022d12a - At the end of the game, highlight incorrectly marked squares.
8bfd711 - use multiple-value-bind to bind values, not let*
c7a9210 - make 'neighbors return a list of lists, not a list of cons cells.
246cdd1 - made 'neighbors return a list of (rol col) positions, not (col row) ones.