Test specified spsolver, but didn't pass it to POUNDERS.

Author: jared321

pounders/m/tests/benchmark_pounders.m

@@ -95,6 +95,7 @@
         Options.hfun = hfun;
         Options.combinemodels = combinemodels;
         Options.printf = printf;
+        Options.spsolver = spsolver;
 
         [X, F, hF, flag, xk_best] = pounders(Ffun, X_0, n, nf_max, g_tol, delta_0, m, Low, Upp, [], Options);