Split into two anchors.

This is a major change; instead of creating a mutual anchor (funding)
transaction, each side creates its own.  We use escape transactions in
case anything goes wrong; these will be revoked later.

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

test-cli/create-commit-spend-tx.c

@@ -6,7 +6,6 @@
 #include <ccan/err/err.h>
 #include <ccan/structeq/structeq.h>
 #include "lightning.pb-c.h"
-#include "anchor.h"
 #include "bitcoin/base58.h"
 #include "pkt.h"
 #include "bitcoin/script.h"