Disable pca_pt output (Way too big)

exp/run.d/pca_pt.sh

@@ -10,6 +10,6 @@ dump_pca_pt() {
 }
 
 command_pca_pt() {
-    echo MR_NUMPROCS=$threads $cmd_prefix $PCA_PT_BIN -r 4000 -c 4000
+    echo "MR_NUMPROCS=$threads $cmd_prefix $PCA_PT_BIN -r 4000 -c 4000 >/dev/null"
 }