Install benchmarking command if needed

src/freedombone-controlpanel

 
 function performance_benchmarks {
     clear
+
+    if [ ! -f /sbin/hdparm ]; then
+        apt-get -yq install hdparm
+        clear
+    fi
+
     test_drive=/dev/sda1
     if [ -f /dev/mmcblk0 ]; then
         test_drive=/dev/mmcblk0