OpenWRT now supports the CISCO Meraki enterprise class routers
MR12, MR16, MR62 and MR66. The fabric firmware demands the yearly
renewal of a support license.

This firmware was successfully tested by @Garunda for the MR62 (and
the MR12 with it for which this is an alias). The initial firmware
pre OpenWRT adoption was prepared and adapted for Gluon by @tcatm.
The confirmation of the functionality of the image for the MR66
(and the aliased MR16 with it) is still pending.

The devices are of strategic interest to the Freifunk community as
they are making a rock-solid impression. However, these come with
fairly hefty annual license. The Freifunk may offer an escape route
for those who had signed up and want to keep their investment into the
similarly expensive hardware. Used evices sell for $60 on eBay/Amazon
in the US. Here in the old world it is all >300 €, still.

Credits go to @Garunda for testing, to @tcatm for finding the
OpenWRT patch prior to its adoption and preparing the initial Gluon
adaptation, to @smoe for the update once that patch had arrived in
OpenWRT, and to @NeoRaider for his review and advice to use
GluonModelAlias for MR62 and MR66 to point to MR12 and MR16,
respectively.

Update the naming of some TP-Link devices corresponding to commit 0fd48fd7dab066db8a46e51775579c9ef507ca25 within git.openwrt.org/15.05/openwrt.git

The Hornet UB is sold at least in the varieties. Without case it is a Hornet UB, with case and without connected USB port it is called AP121. If the USB port is present this device is called AP121U.
We have a AP121U in our mesh http://meshviewer.chemnitz.freifunk.net/#!v:m;n:00c0ca6efffa

This CPE is supported by OpenWRT and already running in Chemnitz

Tests done to verify that this worked as intended:
 * checked plattform_info image_name
 * checked primary_mac
 * does appear in ffmap-d3
 * does mesh
 * does fastd-VPN

Also remove the BROKEN check as the UniFi Outdoor Plus support seems to
work fine now.

Fixes #272

Signed-off-by: Felix Kaechele <felix@kaechele.ca>

Also
* create list of newly supported devices since v2015.1.2 in the v2015.2 release notes
* update information on docs/user/x86
* fix a comment in targets/ar71xx-generic/profiles.mk

These devices are identical to the TL-WR941 v4 & v5, so we don't need to
test them explicitly.

Use the same image for sysupgrade on WZR-HP-AG300H and WZR-600DHP, but use
different factory images.

This reverts commit 8ad3c881.

We can't use the same image for these two devices, so as a workaround,
remove ZR-600DHP from the name for now, so the autoupdater can work and
users aren't confused.

This reverts commit 6da1677d.

This broke due to a recent OpenWrt update.

Tested-by: @kokel

While the images are the same that are used for the Bullet M, adding these
copies will help users choose the correct image for their device.

These are identical to the TL-WR941ND (and identify as TL-WR941ND
internally).

Tested-by: @RubenKelevra