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From James Harvey (via a period of collaborative polishing), a patch
to add two kinds of Penrose tiling to the grid types supported by Loopy. This has involved a certain amount of infrastructure work, because of course the whole point of Penrose tilings is that they don't have to be the same every time: so now grid.c has grown the capacity to describe its grids as strings, and reconstitute them from those string descriptions. Hence a Penrose Loopy game description consists of a string identifying a particular piece of Penrose tiling, followed by the normal Loopy clue encoding. All the existing grid types decline to provide a grid description string, so their Loopy game descriptions have not changed encoding. [originally from svn r9159]
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