Older Mac OS X doesn't have strnlen.

This is an incompatible babelz protocol change.

We used to recompute this in parse_packet, which is clearly the
wrong place.

The kernel encodes frequency information as a pair of a mantissa and
an exponent.  The previous code only dealt with exponent being 0 or 1.
We now deal with exponents up to 6.

This moves all metric computation back to route.[ch],
where it belongs.

Conflicts:
	CHANGES
	babeld.c
	kernel_socket.c
	network.c
	route.c
	route.h

This is useful in order to provide extra information to a graphic
front-end.  In can cause the RIB to explode in some pathological cases,
so it is not the default.

Working out exactly when to call local_notify_neighbour is too
error-prone.  Call it systematically, at the cost of some extra
local traffic.

This fixes a bug where we forgot to call local_update_neighbour
when receiving an IHU.  Reported by Gabriel Kerneis.

Reported by Gabriel Kerneis.

It triggers fairly often with the new routing changes.

The old name conflicts with autoconf-generated files.

This had never been implemented, we were silently ignoring duplicate
configuration lines.

This had never been implemented, we were silently ignoring duplicate
configuration lines.

Noted by Matthieu Boutier.

Noted by Matthieu Boutier.

As suggested by Dave Taht and Julien Cristau.

As suggested by Dave Taht and Julien Cristau.