Ben Harris 0bd1a80578 Magnets: add a check that magnets don't wrap between lines
There was nothing in Magnet's description validation to prevent there
being the left end of a magnet at the right end of a row and the right
end of a magnet at the left end of the row below.  Indeed as far as I
can such a game (e.g. 3x3:..2,2..,...,1.1,TLRB*LRLR) plays entirely
correctly except that one magnet is discontinuous.

While this worked, it was entirely an artefact of the particular memory
layout that Magnets uses and shouldn't have been allowed, so I've added
an additional validation rule to stop it.
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This is the README accompanying the source code to Simon Tatham's
puzzle collection. The collection's web site is at
<https://www.chiark.greenend.org.uk/~sgtatham/puzzles/>.

The puzzle collection is built using CMake <https://cmake.org/>. To
compile in the simplest way (on any of Linux, Windows or Mac), run
these commands in the source directory:

  cmake .
  cmake --build .

The manual is provided in Windows Help format for the Windows build;
in text format for anyone who needs it; and in HTML for the Mac OS X
application and for the web site. It is generated from a Halibut
source file (puzzles.but), which is the preferred form for
modification. To generate the manual in other formats, rebuild it,
or learn about Halibut, visit the Halibut website at
<https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.
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