The older busybox-based wget erroneously accepted URLs without protocol.
Add validator to avoid building firmwares with broken autoupdates.

Adding hints that the next_node name should contain a dot to avoid (mobile) browsers interpreting "nextnode" as searchphrase. Also setting it to an fqdn helps when clients use static dns servers.

This device has built in wifi we should include it at least for experiments.

Some files have received some additional refactoring.

In particular, this affects users of gluon.util.iterate_radios.

The new gluon.site lua library will eventually replace gluon.site_config
(which is hereby deprecated, but will continue to be supported for a
while).

The new gluon.site library will wrap all values to allow traversing
non-existing tables without errors.

    site = require 'gluon.site'
    c = site.a.b.c -- doesn't fail even if a or a.b don't exist

The wrapped values must be unwrapped using call syntax:

    site_name = site.site_name()

Using the call syntax on a non-existing value will return nil. An
alternative default value may be passed instead:

    mac = site.next_node.mac('16:41:95:40:f7:dc')

Fixes #1021

simple-uci will now delete an option when nil is passed.

simple-uci will now delete an option when nil is passed.

simple-uci will now delete an option when nil is passed.

simple-uci will now delete an option when nil is passed.

uci:set_list() will delete the list when nil is passed, so there is no need
to differentiate between the cases.

The generic upgrade script is moved to run after the more specific scripts.
In addition, the script will now remove the configuration sections of
uninstalled VPN packages, so both positive and negative changes of the
default enable state can be migrated correctly.

Based-on-patch-by: Cyrus Fox <cyrus@lambdacore.de>
Fixes: #1187

This reverts commit 819758f4.

A proper fix is now available, therefore reverting this workaround.

Updates batman-adv and alfred to 2017.2 and adds the batman-adv TT-sync
fix.

Fixes #1183