Add nooz

newsfragments/267.misc.rst

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+This (finally) adds fully acknowledged remote cancellation messaging
+support for both explicit ``Portal.cancel_actor()`` calls as well as
+when there is a "runtime-wide" cancellations (eg. during KBI or general
+actor nursery exception handling which causes a full actor
+"crash"/termination).
+
+You can think of this as the most ideal case in 2-generals where the
+actor requesting the cancel of its child is able to always receive back
+the ACK to that request. This leads to a more deterministic shutdown of
+the child where the parent is able to wait for the child to fully
+respond to the request. On a localhost setup, where the parent can
+monitor the state of the child through process or other OS APIs instead
+of solely through IPC messaging, the parent can know whether or not the
+child decided to cancel with more certainty. In the case of separate
+hosts, we still rely on a simple timeout approach until such a time
+where we prefer to get "fancier".