Use blocked algorithm as the default one

To avoid testing nopiv without ChamUnit which is not supposed to works corrctly and only pass because threshold is tolerant... @kuhn

compute/zgetrf.c

@@ -24,7+24,7 @@
  * @precisions normal z -> s d c
  *
  */
 #include "control/common.h"
 
 /**
  ********************************************************************************
@@ -62,7+62,7 @@
     }
 
     ws = calloc( 1, sizeof( struct chameleon_pzgetrf_s ) );
-    ws->alg = ChamGetrfNoPiv;
+    ws->alg = ChamGetrfPPiv;
     ws->ib  = CHAMELEON_IB;
 
     {