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I've just noticed a bug in the Inertia solver: if you call it on an
already-solved grid (i.e. no gems), it will still attempt to show
you a move you can make. Eliminate that special case.

[originally from svn r6507]

--- a/inertia.c

+++ b/inertia.c

@@ -735,6 +735,18 @@

     char *err, *soln, *p;

     /*

+     * Before anything else, deal with the special case in which

+     * all the gems are already collected.

+     */

+    for (i = 0; i < wh; i++)

+	if (currstate->grid[i] == GEM)

+	    break;

+    if (i == wh) {

+	*error = "Game is already solved";

+	return NULL;

+    }

+

+    /*

      * Solving Inertia is a question of first building up the graph

      * of where you can get to from where, and secondly finding a

      * tour of the graph which takes in every gem.