Contribution to Tazusb clean

#...............................................................................
# Begin code alterations - 13.10.2014 - Rodrigo Boechat                        .
# Reason:                                                                      .
# A new clean_usb implementation was necessary to follow the alterations made  .
# on writefs.                                                                  .
#...............................................................................
#...............................................................................
# Maintained the original code without alterations.                            .
# Thus, the original was renamed "clean_usb_orig".                             .
#...............................................................................

# Clean out old backups to save disk space
clean_usb_orig()
{
    echo ""
    echo -en "\033[1m`gettext \"Clean\"`\033[0m
================================================================================"
gettext "Remove old rootfs.gz.unixtimestamp backup filesystems to free up disk space."; echo -e "\n\n"
    # Locate and interactively remove old filesystems from /home directory
    for file in `find /home/boot/rootfs.gz.[0-9]*`
    do
        gettext "Do you wish to remove: `basename $file` (Yes/no/exit) ? "
        read answer
        case $answer in
            e|E|"exit"|Exit)
                exit 0 ;;
            y|Y|yes|Yes)
                rm -f $file ;;
            *)
            gettext "No filesystems selected, exiting..." ; echo "" ;;
        esac
    done
}

#...............................................................................
# 13.10.2014 - Rodrigo Boechat                                                 .
# Now is also necessary that the "clean_usb" knows how to handle entries       .
# in boot menu.                                                            .
#...............................................................................
clean_usb()
    {
    echo ""
    echo -en "\033[1m`gettext \"Clean\"` Usb\033[0m
================================================================================"
    gettext "Remove old unixtimestamp.rootfs.gz backup filesystems to free up disk space."; echo -e "\n\n"
    gettext "What do you wish to do?"
    echo -en "
\033[1mStandard\033[0m Cleaning - Deletes all backups except the latest.
Complete Cleaning - Deletes all backups.

    \033[1mST\033[0m for Standard
    CO for Complete
    Exit

    (St/co/exit):: "

    read vAnswer

    echo -e "\n"

    case $vAnswer in
       ST|St|sT|st)
           #..................................................................
           # Remove all but the latest backup.                               .
           # As the latest backup should be in boot menu entry, no change in .
           # extlinux.conf & isolinux.cfg is necessary.                      .
           #..................................................................
           for file in $(find /home/boot/[0-9]*.rootfs.gz | sort -r | sed '1{/.*/d}')
           do
              echo "Removing $file..."
              rm -f "$file"
           done
           echo "Everything done."
           ;;
       CO|Co|cO|co)
           #..................................................................
           # Remove all backup.                                              .
           #..................................................................
           echo "Erasing all backup. Wait a minute or two..."
           find /home/boot/[0-9]*.rootfs.gz -exec rm -f '{}' \;

           #..................................................................
           # Retrieve the home UUID from extlinux.conf.                      .
           #..................................................................
           vHome=$(cat /home/boot/extlinux/extlinux.conf | grep "home" | tail -n 1 | awk -F ' ' '{print $8}')

           #..................................................................
           # Clear the Restore menu entry, from extlinux.conf & isolinux.cfg .
           # and switch back to "# Space Reserved for Recovery #" instead.   .
           #..................................................................
           echo "Clearing extlinux & isolinux..."
           sed -i ':a;N;$!ba;s/LABEL tazUsbRecovery\n\tMENU LABEL SliTaz Usb Recovery\n\tCOM32 c32box.c32\n\tappend linux \/boot\/bzImage initrd=\/boot\/[0-9]*.rootfs.gz rw root=\/dev\/null autologin '$vHome'/# Space Reserved for Recovery #/' /home/boot/extlinux/extlinux.conf
           sed -i ':a;N;$!ba;s/LABEL tazUsbRecovery\n\tMENU LABEL SliTaz Usb Recovery\n\tCOM32 c32box.c32\n\tappend linux \/boot\/bzImage initrd=\/boot\/[0-9]*.rootfs.gz rw root=\/dev\/null autologin '$vHome'/# Space Reserved for Recovery #/' /home/boot/extlinux/isolinux.cfg

           echo "Everything done."
           ;;
       e|E|"exit"|Exit)
           echo "Exiting..."
           exit 0
           ;;
       *)
           echo "Instruction not recognized. Exiting..."
           exit 0
           ;;
    esac
}
#...............................................................................
# End code alterations - 13.10.2014 - Rodrigo Boechat                          .
#...............................................................................