The release includes support for the new motherboard (a.k.a. scb).
It include SDB support for hardware identification, an update procedure
that can replace the boot loader, better code in the web server and
a new organization for documents. It also removes ptp-noposix,
to simplify addition of new features and code cleanup.

Installations of v4.0 can be updated over the network.

The release runs gateware version 4.0: new gateware features will be
available in wr-switch-sw v4.2