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Mention how old the 15-puzzle is

For most puzzles, the manual tries to at least mention its origin.
Wikipedia suggests that the precise inventor of the 15-puzzle is a bit
uncertain, but US patent number 207124 definitely describes it in
1878, so "dates from the 1870s" seems pretty solid.

--- a/puzzles.but

+++ b/puzzles.but

@@ -601,7 +601,8 @@

 \cfg{winhelp-topic}{games.fifteen}

 The old ones are the best: this is the good old \q{\i{15-puzzle}}

-with sliding tiles. You have a 4\by\.4 square grid; 15 squares

+with sliding tiles, which dates from the 1870s.

+You have a 4\by\.4 square grid; 15 squares

 contain numbered tiles, and the sixteenth is empty. Your move is to

 choose a tile next to the empty space, and slide it into the space.

 The aim is to end up with the tiles in numerical order, with the