[ccan] CCAN Update for 2015-07

[Rusty Russell]

Hi all!

	You can tell when I'm working on a new ccan-using project,
as I get an excuse to work on ccan/tools :)

Module of the Month: ccan/asearch
=================================

        This makes using the standard binary search bsearch() typesafe
and friendly (asort does a similar thing for qsort).  Instead of
creating a "cmp(const void *, const void *)", use your real pointer
types and you'll get the typesafety you expect.  It also adds a third
void * context argument which is occasionally useful (and horrible if
you need it and don't have it).

New modules:
============
	crypto/ripemd160: simple RIPEMD160 routines (can use openssl)
        order: Module for comparison callbacks (thanks David Gibson)

Minor updates & bugfixes:
========================
        asort: Use order module definitions
        avl: Use definitions from order module
        bitmap: Don't crash if allocation fails in bitmap_alloc0() & friends
                (thanks Kirill Smelkov)
        crypto/sha256: add benchmarks, fix open-ssl variant
        daemonize: check setsid() return value, use _exit
                (thanks Maxim Zakharov)
        lqueue: Allow a queueu to be initialized from an existing back element
        lstack: Allow a stack to be initialized from an existing top element
        ntdb: don't overlap with test filenames: avoid spurious ccanlint fails.
        opt: add opt_usage_exit_fail helper for easy "bad usage" messages.
        short_types: Fix warning in test with -Wextra
                (thanks Joel Stanley)

Tools updates:
=============
        ccanlint: handle circular test-depends.
        modfiles: new tool to list files in a module.
        create-ccan-tree: fix nested modules with -a

Cheers,
Rusty.