option to disable wifi on boot

[needlestack]

for RACHEL Plus, from @spatiald

a starting point:

if (isset($_GET['wifi']))
    if ($_GET['wifi'] == "on") {
        echo "Turning WIFI ON... ";
        exec("/etc/WiFi_Setting.sh");
        exec("/bin/rm /root/rachel-scripts/disable_wifi");
    } else if ($_GET['wifi'] == "off") {
        echo "Turning WIFI OFF... ";
        exec("/sbin/ifconfig wlan0 down");
        exec("/bin/echo 'Wifi disabled.  Delete this file to re-enable.'", $output);
        file_put_contents('/root/rachel-scripts/disable_wifi', $output);
    }
    echo "Done.";
}

also must figure out for RACHEL Pi

---

@needlestack

Oh cool - I will do this. Although I think I'm going to make it so that it there are separate controls
for turning wifi on/off and disabling it entirely (even on reboot) -- what do you think?

@spatiald

Agree - maybe a checkbox that enables permanence? We also need the
repairRachelScripts() function to run that will add the check for the disable flag. Can you
run that if the permanence flag is set?