Add drive formatting to the control panel

src/freedombone-controlpanel

     esac       
 }
 
+function format_drive {
+    drive=
+    
+    data=$(tempfile 2>/dev/null)
+    trap "rm -f $data" 0 1 2 5 15
+    dialog --backtitle "Freedombone Control Panel" \
+           --title "Format a USB drive" \
+           --radiolist "Choose a drive:" 14 70 5 \
+           1 "sda (Beaglebone Black)" off \
+           2 "sdb" off \
+           3 "sdc" off \
+           4 "sdd" off \
+           5 "Back to Backup and Restore menu" on 2> $data
+    sel=$?
+    case $sel in
+        1) return;;
+        255) return;;
+    esac
+    case $(cat $data) in
+        1) drive='sda';;
+        2) drive='sdb';;
+        3) drive='sdc';;
+        4) drive='sdd';;
+        5) return;;
+    esac
+
+    dialog --title "Format USB drive" \
+           --backtitle "Freedombone Control Panel" \
+           --defaultno \
+           --yesno "\nPlease confirm that you wish to format drive\n\n${drive}\n\n. All current data on the drive will be lost, and you will be prompted to give a password used to encrypt the drive.\n\nIf you screw up here and format the wrong drive it's your own fault!" 10 60
+    sel=$?
+    case $sel in
+        1) return;;
+        255) return;;
+    esac
+
+    clear
+    freedombone-format $drive
+    any_key
+}
+
 function menu_backup_restore {
     while true
     do
         trap "rm -f $data" 0 1 2 5 15
         dialog --backtitle "Freedombone Control Panel" \
                --title "Backup and Restore" \
-               --radiolist "Choose an operation:" 15 70 8 \
+               --radiolist "Choose an operation:" 16 70 9 \
                1 "Backup data to USB drive" off \
                2 "Restore GPG key from USB keydrive" off \
                3 "Restore data from USB drive" off \
                5 "Restore from remote backup" off \
                6 "Backup GPG key to USB (master keydrive)" off \
                7 "Backup GPG key to USB (fragment keydrive)" off \
-               8 "Back to main menu" on 2> $data
+               8 "Format a USB drive" off \
+               9 "Back to main menu" on 2> $data
         sel=$?
         case $sel in
             1) break;;
             5) restore_data_remote;;
             6) create_keydrive_master;;
             7) create_keydrive_fragment;;
-            8) break;;
+            7) format_drive;;
+            9) break;;
         esac
     done
 }