Code review comment for lp://qastaging/~mir-team/mir/trunk-0.1.6

wasn't sure to include bug 1285955 as fixed, as the mp is more of a temp workaround - but i'll include that.

I'm torn about condensing the changelog - i prefer the detail. But, happy to conform to convention.
I'll take one more scrub, but then let's move on getting this in.

> The diff to tagged release 0.1.6 is good. Only changelog differs.
>
> Only mentions of last minute bugs are missing from changelog:
> bug 1285955
> bug 1207312
>
> I would also recommend not cluttering the changelog with details of internal
> changes that users of Mir won't ever need to understand. e.g. All but one of
> these are meaningless to the public Mir SDK so should not be mentioned;
>
> 396 + - config, frontend: remove force_threads_to_unblock_callback()
> 397 + - Protect input region member of surface data, hold mutex to
> access
> 398 + hidden member.
> 399 + - config: ConfigurationOptions::default_ipc_threads can be a
> constant.
> 400 + - debian: Provide platform packages managed with dpkg
> alternatives.
> 401 + - Add the ability to load device traces, both udev and ioctls, in
> the
> 402 + UdevEnvironment test helper.
> 403 + - test_client_input.cpp: Remove unused global "mir_test_socket".
> 404 + - Sundry improvements to mir::udev.
>
> That's not all. I just picked it as an example. Only line 400 would qualify as
> meaningful to anyone else, so release notable.