targets/ar71xx-generic: add WD MyNet N600/N750

docs: add link to tecff/site-ffa (Altdorf, Landshut & Umgebung)

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

-spelling

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

gluon-mesh-batman-adv-core: keep disabled state even when the mesh interface section name is changed

Fix typo in LICENSE

This patch is already included in the current OpenWrt CC branch.
Cherry-pick for now as we're very close to the Gluon 2015.2 release.

In line 2: indiviual -> individual

The trunk version of mac80211 doesn't need these dependencies anymore as
they are compiled into the kernel.

While this didn't cause any issues for Gluon as we always build the kernel
with all modules, this fix makes the patch work on a plain OpenWrt CC as
well.

gluon-mesh-batman-adv-core: keep disabled state even when the mesh interface section name is changed

Is makes sense to always look for both ibss_radio* and mesh_radio* sections
to determine if the meshing should be enabled when regenerating these
sections. Doing this, the disabled state will survive updates changing the
section name (either updating from pre-2015.2 while keeping IBSS, or
changing from IBSS to 11s or vice-versa).

If both ibss_radio* and mesh_radio* sections exist, the disabled state will
be kept correctly for each section, the behaviour is changed only when
creating a section that didn't exist before.

Fixes #549

PKG_FILE_DEPENDS caused the whole site repo to be hashed to determine if
gluon-site needed rebuilding. While this is normally no problem,
alternative build setups sometimes put the Gluon repo inside the site repo,
causing long build times and parallel build failures.

docs: improve user/getting_started, some minor fixes in user/site

in a layer 2 mesh network, multicast pings cause a lot of traffic in the
network, significantly increasing the 'backgroudn noise' (= Grundrauschen)
and stressing nodes in the network.

this commit blacklists all icmpv4 multicast traffic as well as multicast
icmpv6 echo-requests and node iformation queries. as no application
depending on these types of multicast traffic is known, blacklisting is safe.

Fixes #550

This commit basically does two things: it urges users always to use an own
git repository to manage the site configuration, and it removed all
mentions of "communities" from the "Getting started" page, as it was too
Freifunk-specific.

Other documentation pages (especially the site configuration docs) should
probably be adjusted as well.

Confusion of WAN an LAN, this line is for mesh-on-lan

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

usign has pulled in new dependencies, and OpenWrt doesn't like the command
`make tools/prepare` in a clean build.