=str Fix scaladoc warnings
+str #15205 Java API for FlexiRoute
+str #15802 Make TickSource cancellable

* also found a type bug in javadsl Source.subscriber
=str #15795 Add overflow protection in ActorPublisher
+str #15086 substream publishers now have subscription-timeouts
Merge pull request #16232 from akka/wip-15802-cancellable-tick-patriknw

+str #15802 Make TickSource cancellable
Merge pull request #16227 from akka/wip-15205-route-java-patriknw

+str #15205 Java API for FlexiRoute
Merge pull request #16234 from akka/wip-scaladoc-warns-patriknw

=str Fix scaladoc warnings
Merge pull request #16215 from ktoso/wip-timeout-untouchedstreams-ktoso

+str #15086 subscription-timeout for publishers in streamsofstreams
Merge pull request #16237 from akka/wip-15795-overflow-check-patriknw

=str #15795 Add overflow protection in ActorPublisher
+str #16073 readPreferred for FlexiMerge
Merge pull request #16236 from ktoso/wip-readPreferred-fleximerge-ktoso

+str #16073 readPreferred for FlexiMerge
!str #16235 Rename Sink.future to Sink.head
Merge pull request #16239 from akka/wip-16235-rename-Sink.future-patriknw

!str #16235 Rename Sink.future to Sink.head
Revert "+str #15802 Make TickSource cancellable"

This reverts commit 9e19ab095cd6ae37ea689d00031d58a54a90c912.
Merge pull request #16242 from akka/wip-15802-revert-cancellable-TickSource-patriknw

Revert "+str #15802 Make TickSource cancellable"
=str Fix worst performance hotspot in graph builder

* Set.tail
Merge pull request #16244 from akka/wip-graph-builder-perf-impr-patriknw

=str Fix worst performance hotspot in graph builder
=str Bump snapshot version
Merge pull request #16246 from akka/wip-snapshot-version-patriknw

=str Bump snapshot version