Adding lib/wire.c

[Alex Kiernan]

With all the hacking on nnrpd I've been doing, I've become more & more
aware of the amount of duplication we have in the manipulation of
articles.

I've started pulling some of the wire format article manipulation into
lib/wire.c (but right now all there is a wire_findbody[1])

Good idea/bad idea?

[1] the only reason I implemented this one was it stuck out at the top
of a profiling session as the number one user of CPU cycles

-- 
Alex Kiernan, Principal Engineer, Development, THUS plc