CCAN update for 2015-11

Hi!

A quiet month, but I found myself needing an fd-returning fopen
call, so wrote pipecmd. Much more activity over graph traversal from David Gibson.

Module of the Month: cast (LGPL2.1+)
====================================

This is a simple module which provides macros to make casting safer and more explicit. In particular, "cast_const(char *, foo)" gives a warning if foo isn't a "const char *". Similarly, cast_signed() will only change signedness, and cast_static() will only do casts which would have been implicit in C.

New modules:
============
pipecmd: fork a command with explicit fds attached.

Updates & bugfixes:
========================
aga: many minor fixes, documentation updates (David Gibson) aga, agar: Dijkstra's algorithm (David Gibson)
net: use close_noerr()
noerr: add free_noerr()
strgrp: add cosine similarity filter (Andrew Jeffery)

Cheers,
Rusty.
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