wr-switch-sw-v3.0 is released

This release is the work of myself, Federico Vaga, Benoit Rat and Tomasz Wlostowski,
in no particular order (and with contributions by others).
The HDL code in the switch it mainly by Tomasz Wlostowski but
also includes parts by Grzegorz Daniluk and other developers.

We released the tar of the repository at the tag position, with compiled
documentation included, the pdf of the documentation and the tar of the binaries ready
to be flashed in the device.