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CHT-MPI version 2.0 release notes, 2021-01-09
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The following changes were made compared to the previous version:

- Allow for multiple registrations of the same chunk/task type.

- The responsibility for child chunks moves from the user to the
  Chunks and Tasks library.
  * The user sets and gets child chunks using two new member functions
    of the Chunk base class: setChildren and getChildren. The runtime
    library handles the children. No chunk identifiers should be
    stored in chunk objects.
  * The user should no longer specify the lifespan of chunks
    (previously done using the cht::temporary or cht::persistent
    arguments to chunk and task registration).
  * The runtime library automatically keeps track of the needed
    lifespan of each chunk.
  * The copyChunk function has been removed. The runtime library takes
    care of copies internally when needed.

- A few task types added to cht_type_lib.

- Encapsulate task lists used in TaskSchedulerService in a
  TaskListManager class, useful for e.g. "thread-local task tree"
  experiments.

- Various optimizations, bugfixes, and code cleanup.