Ceci

Enables using dask parallelismm by specifying dask_parallel on a stage class, and running with dask-mpi.

Fixes a bug in v1.4 that stops one of the new features from being activated.

This release adds some new features and changes. It should not affect existing workflows, though environments will need to update to a newer version of parsl to use it.

- Uses Parsl >= 1.0.0
- Adds a flag `--no-xyz` for any boolean option xyz (to match the existing `--xyz` flag
- Adds a flag `--memmon N` to print available memory every N seconds
- Preliminary CC-IN2P3 support
- Uses newer versions of Parsl and makes the version number more flexible.

Version 1.1 adds the python_paths feature, which adds to the PYTHONPATH variable for both the pipeline manager and any jobs launched.

Code formatting
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- Bug fixes