=str #15900 Make fanout publisher actor name unique
=str #15892 Fix ClassCastException in ThunkSource

* and add test
Merge pull request #15994 from akka/wip-15892-ClassCastException-ThunkSource-patriknw

=str #15892 Fix ClassCastException in ThunkSource
Merge pull request #15997 from akka/wip-15900-fanout-actor-name-patriknw

=str #15900 Make fanout publisher actor name unique
+str #15996 Add mapAsyncUnordered

* rename mapFuture to mapAsync
* add mapAsyncUnordered
* extract common things for emits to a trait
Merge pull request #15999 from akka/wip-15996-unordered-mapFuture-patriknw

+str #15996 Add unorderedMapAsync
+str #15960 Correction of FlowGraph variance
Merge pull request #16005 from akka/wip-15960-FlowGraph-variance-patriknw

+str #15960 Correction of FlowGraph variance
+str #15875 Hook-up unzip operation in the new Streams DSL

* handle output ports in FlowGraph
Merge pull request #16004 from akka/wip-15875-unzip-patriknw

+str #15875 Hook-up unzip operation in the new Streams DSL
=str #15960 Fix broken FlowGraphCompileSpec

* FlowGraphCompileSpec broke when merging in the unzip on top of
  the variance adjustements
* JunctionOutPort[T] must not be defined like JunctionOutPort[+T]
  because then the NextT = Nothing doesn't work
* Do we have a reason to use JunctionOutPort[+T]? I added +T
  only for symmetry reasons with JunctionInPort[-T].
Merge pull request #16008 from akka/wip-15960-variance-take2-patriknw

=str #15960 Fix broken FlowGraphCompileSpec
=str #16001 Propagate error to FoldSink's future

* align OnCompleteSink's implementation of error/success handling with
  that of other Sink's
Merge pull request #16006 from volkerstampa/wip-16001-foldsink-error-handling-volkerstampa

Propagate error to FoldSink's future. Fixes #16001
+htp #15910 import + improve coding infrastructure from spray