Structured concurrency & Job cancellation improvements#1020

Merged

qwwdfsad merged 7 commits intodevelopfrom

cancel-exception

Mar 13, 2019

Commits on Mar 1, 2019

Commits on Mar 5, 2019

Make JobCancellationException copyable in debug mode
elizarov
committed

Commits on Mar 6, 2019

Added clarification on deprecation version in code, better CE messages
elizarov
committed
Added test for stack-trace recovery in JobCancellationException
elizarov
committed
Restore all state in TestBase even when test fails
elizarov
committed