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License: MIT
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>

Instead of just terminating right there and then, we cancel the
context, and let the daemon exit cleanly. This make take a few
seconds, as the node builder and its child processes do not
care too much about the context state while building nodes,
but this can be improved by injecting checks for ctx.Done()
before time-consuming steps.

When the response includes the X-Chunked-Output header, we treat that
as channel output, and fire up a goroutine to decode the chunks. This
routine need to look for context cancellation so that it can exit
cleanly.

The context may be cancelled while a request is in flight. We need to
handle this and cancel the request. The code is based on the ideas
from https://blog.golang.org/context

- Modified Godeps/Godeps.json by hand
- [TEST] Updated welcome docs hash to sharness
- [TEST] Updated contact doc
- [TEST] disabled breaking test (t0080-repo refs local)

- updated go-ctxgroup and goprocess
ctxgroup: AddChildGroup was changed to AddChild. Used in two files:
- p2p/net/mock/mock_net.go
- routing/dht/dht.go

- updated context from hg repo to git
prev. commit in hg was ad01a6fcc8a19d3a4478c836895ffe883bd2ceab. (context: make parentCancelCtx iterative)
represents commit 84f8955a887232b6308d79c68b8db44f64df455c in git repo

- updated context to master (b6fdb7d8a4ccefede406f8fe0f017fb58265054c)

Aaron Jacobs (2):
net/context: Don't accept a context in the DoSomethingSlow example.
context: Be clear that users must cancel the result of WithCancel.

Andrew Gerrand (1):
go.net: use golang.org/x/... import paths

Bryan C. Mills (1):
net/context: Don't leak goroutines in Done example.

Damien Neil (1):
context: fix removal of cancelled timer contexts from parent

David Symonds (2):
context: Fix WithValue example code.
net: add import comments.

Sameer Ajmani (1):
context: fix TestAllocs to account for ints in interfaces

Let's save log.Error for things the user can take action on.
Moved all our diagnostics to log.Debug. We can ideally reduce them
even further.

Progress Bars

squash! commands/files: Added PeekFile and StatFile interfaces

commands/http: Updated test

squash! commands: Added Length field to Response

commands/http: client: Fixed error on unset length

Serial File Opening

@mappum would this work?

cc @mappum can we do this for the copyChunks case?

using Header().Set after WriteHeader() has no effect.
cc @mappum