Muscle3

Incompatible changes

- `compute_elements` are now called `components` in .ymmsl files

Improved

- Use latest OpenSSL library when installing it automatically

Fixed

- Handling of non-contiguous and F-order numpy arrays
- C++ memory usage for large dicts/lists now more reasonable
- Improved shutdown when Python submodel crashes
- Logging warning message

Improved

- Accessing settings from C++ now more flexible
- Python produces more detailed logs to aid in debugging
- Improved pkg-config set-up
- Improved build system output to help find problems
- Documentation on logging in Python
- Protobuf dependency build now more compatible

Fixed

- C++ list/dict building functions
- C++ use-after-free when receiving grids

Thanks

- Pavel for testing and reporting issues
- Dongwei for testing and reporting issues

Added

- Support for sending and receiving multidimensional grids/arrays
- Support for Python 3.8

Improved

- Python 3.5.1 support
- Build compatibility on more operating systems

Thanks

- Olivier for testing, reporting and fixing build issues
- Pavel for testing and reporting build issues
- Hamid for testing and reporting build issues
- Ben for testing and reporting build issues

Incompatible changes

- Data::key() now returns std::string instead of DataConstRef.
- Data::value() now return Data rather than DataConstRef

Added

- Support for Fortran, including MPI

Improved

- Fixes to examples
- Small documentation improvements
- Improved compatibility with other packages using gRPC

Thanks

- Pavel for reporting documentation/examples issues
- Derek for testing on Eagle
- Dongwei for reporting the gRPC issue

Added

- Support for C++
- Support for MPI in C++

Improved

- Cluster/HPC networking

Incompatible Changes

- Fatal logic errors now throw instead of exiting, so that you have a chance
to shut down the model cleanly before exiting.
- `Instance.exit_error()` was replaced by `Instance.error_shutdown()`, which no
longer exits the process, it just shuts down the Instance.
- Central MUSCLE 3-managed settings are called settings everywhere now, not
parameters. As a result, the API has changed in several places.

Initial release of MUSCLE 3.

Added

- Coupling different submodel instances
- Spatial and temporal scale separation and overlap
- Settings management
- Combining features
- Python support
- Initial distributed execution capability