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Galaxies: fix edge coordinates in a diagnostic.

The coordinates in this 'Setting edge' message from the solver don't
match the coordinates of the edge that is actually set. No wonder the
solver output was confusing!

--- a/galaxies.c

+++ b/galaxies.c

@@ -1857,7 +1857,7 @@

         if (!(edge_opp->flags & F_EDGE_SET)) {

             solvep(("%*sSetting edge %d,%d as opposite %d,%d\n",

                    solver_recurse_depth*4, "",

-                   tile_opp->x-dx, tile_opp->y-dy, edge->x, edge->y));

+                   tile_opp->x+dx, tile_opp->y+dy, edge->x, edge->y));

             edge_opp->flags |= F_EDGE_SET;

             didsth = 1;

         }