Using HTTPS breaks the download on Debian Wheezy. The switch was an
unintended side effect of the backport from LEDE.

Also, fix the commit message of the backport patch (mwlwifi is not updated
anymore since the last OpenWrt base upgrade).

Fixes #919

If cookies are disabled, the Statuspage only displays an empty ("Not connected")
This checks if the localStorage API is available and working and only uses it in this case
Also allows better backwards compatibility.

Tested build on a minimal Ubuntu 16.04 container image without wget.

Tested-by: Jannis Pinter <jannis@pinterjann.is>

The downgraded version of ath9k was reported to cause issues with Windows
clients before. Remove the problematic patch.

In addition, the temperature compensation support patch is reverted.

It seems that newer mac80211 version are less stable, so we downgrade it
for now.

This probably doesn't affect Gluon as nothing is using recvmmsg, but it's
still a good idea to get this fixed ASAP.

docs: update link to site repository of Freifunk MWU

Fixes #886

If next_node.ip4 is not set or gluon-next-node is not used, prefix4 will
now be optional as well.