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Don't fail an assertion when setting up the provided clues at the
start of the solver, if they contradict each other. (Could trigger on
user-provided grids.)

[originally from svn r9594]

--- a/solo.c

+++ b/solo.c

@@ -1773,9 +1773,16 @@

      * Place all the clue numbers we are given.

      */

     for (x = 0; x < cr; x++)

-	for (y = 0; y < cr; y++)

-	    if (grid[y*cr+x])

+	for (y = 0; y < cr; y++) {

+            int n = grid[y*cr+x];

+	    if (n) {

+                if (!cube(x,y,n)) {

+                    diff = DIFF_IMPOSSIBLE;

+                    goto got_result;

+                }

 		solver_place(usage, x, y, grid[y*cr+x]);

+            }

+        }

     /*

      * Now loop over the grid repeatedly trying all permitted modes