Move from BATMAN_IV to BATMAN_V

[ilario]

For evaluating the links, the version 5 of Batman-adv uses estimated bandwidth (asking to the wireless drivers) rather than packet loss.
It should be just better and stable enough to use (from what I understood from @lindnermarek).

We can try what happens when setting this in the routing_algo https://openwrt.org/docs/guide-user/network/wifi/mesh/batman#batman-adv_options_for_bat0_the_main_mesh_interface

[ilario]

This is now possible to configure as implemented in #1004.

For an example of usage, see https://github.com/libremesh/network-profiles/blob/a94849d301e077a717739928b6462a68367a05b3/calafou/outdoor_nongateway/root/etc/config/lime-community#L8

[ilario]

During Wireless BattleMesh we realized that BATMAN_V is not correctly detecting the throughput of the wifi interfaces, indicating all of them as zero throughput.