Include social key management as an option in the interactive installer

src/freedombone-config

 
   data=$(tempfile 2>/dev/null)
   trap "rm -f $data" 0 1 2 5 15
+  SOCIAL_KEY_STR="\nDo you wish to enable social key management, otherwise known as \"the unforgettable key\"?\n\nThis means that fragments of your GPG key will be included with any remote backups so that if you later lose your key then it can be reconstructed from your friends servers. If you select \"no\" then you can still do social key management, but offline using physical USB thumb drives, which is more secure but less convenient."
+  if [[ $(grep "ENABLE_SOCIAL_KEY_MANAGEMENT" temp.cfg | awk -F '=' '{print $2}') == "yes" ]]; then
+      dialog --title "Social Key Management" \
+             --backtitle "Freedombone Configuration" \
+             --yesno "$SOCIAL_KEY_STR" 15 60
+  else
+      dialog --title "Social Key Management" \
+             --backtitle "Freedombone Configuration" \
+             --defaultno \
+             --yesno "$SOCIAL_KEY_STR" 15 60
+  fi
+  sel=$?
+  case $sel in
+      0) ENABLE_SOCIAL_KEY_MANAGEMENT="yes";;
+      255) exit 1;;
+  esac
+  save_configuration_file
+
+  data=$(tempfile 2>/dev/null)
+  trap "rm -f $data" 0 1 2 5 15
   if [[ $INSTALLING_ON_BBB == "no" ]]; then
       dialog --backtitle "Freedombone Configuration" \
           --radiolist "Type of Random Number Generator:" 10 40 3 \
   fi
 
   if [ -f $CONFIGURATION_FILE ]; then
+      if grep -q "ENABLE_SOCIAL_KEY_MANAGEMENT" $CONFIGURATION_FILE; then
+          ENABLE_SOCIAL_KEY_MANAGEMENT=$(grep "ENABLE_SOCIAL_KEY_MANAGEMENT" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
       if grep -q "GIT_DOMAIN_NAME" $CONFIGURATION_FILE; then
           GIT_DOMAIN_NAME=$(grep "GIT_DOMAIN_NAME" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
       fi