This patch has no functional change, it only changes the procedure for
easier modification of configuration items.

Signed-off-by: Federico Vaga <federico.vaga@gmail.com>

This also adds more information about the wrboot script, no other serious
changes are there.
Signed-off-by: Federico Vaga <federico.vaga@gmail.com>

There is another ohwr project for switch testing

The file I uploaded to ohwr (wrs3-gw-v3.0-20120801.tar.gz) is not
expected to be renamed or overwritten in the future, so this commit
and the following ones will always build properly.

We had this problem with the previous file name being replaced, so
older commits didn't build any more for lack of the required gateware
file or md5sum errors.

Signed-off-by: Federico Vaga <federico.vaga@gmail.com>

Signed-off-by: Federico Vaga <federico.vaga@gmail.com>

This patch also update the relative documentation
Signed-off-by: Federico Vaga <federico.vaga@gmail.com>

build scripts: wrs_build_gateware: use self-compiled RT CPU from rt/ or pre-compiled binary from binaries/. Updated download info for gateware