PGHand convenience functions.
PGSet sumAndDiff added.
PGStrategy handles only-way correctly.
More special-hands test of pgstrategyl
Gets high-nine, gong, wong in right order.
Auto-ordering of computer's tiles done on deal.

Note: computer hand not hidden, for testing purposes.
Even hands numerically.
valuediff testing.
gameplay with computer showing/hiding at right time, start of ordering of sets.
Computer orders sets according to highest sum.
Score comparison, UI for that.
UI color tweaks for win/lose.
New deal resets manipulate.
Scores set using models.
Better score notifications; remove camelCase for model properties.
underscore-case for tile_indexes.
Next deal, game play through entire game.