Address helper, and change prefix to make addresses P/q.

And fix the bitcoin address decode.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
todo: remove 'value computed is not used' from gcc 4.7.2

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Rename generate to pettycoin-generate.

That's the default --generate arg anyway.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Handle duplicate peers (eg. IPv4 and IPv6).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Tools for making and serving seed addresses.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>