=pro Add watchSources for *.rst to akka-docs
=tes #15357 fix for PrettyDurationSpec
=act #13678 #15149 Reply with ActorIdentity(None) from deadLetters

(cherry picked from commit b2f96668baf9efa77de5f97223f055c0a78d0cb8)
Merge pull request #15335 from akka/wip-add-watchSources-for-rst-ban

=pro Add watchSources for *.rst to akka-docs (Forward Port)
Merge pull request #15358 from mkubala/PrettyDurationSpec-fix-mkubala

=tes #15357 fix for PrettyDurationSpec
Merge pull request #15348 from akka/wip-13678-identify-deadLetters-master-patriknw

=act #13678 #15149 Reply with ActorIdentity(None) from deadLetters (for verification)
=per #13962 Close LevelDB snapshots to avoid resource leakage
=per #13898 Make LocalSnapshotStore directory creation more robust
Merge pull request #15375 from akka/wip-13962-investigate-leveldb-compaction-issue-master-ban

=per #13962 Close LevelDB snapshots to avoid resource leakage (Validation)
Merge pull request #15376 from akka/wip-13898-failed-SharedLeveldbJournalSpec-master-ban

=per #13898 Make LocalSnapshotStore directory creation more robust (Validation)