Signac-flow

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Added
+++++

- XSEDE Delta environment and template (658).

Changed
+++++++

- Changed ``get_config_value`` template filter to error without default on missing key (649).
- Changed ``get_config_value`` template filter now takes a ``FlowProject`` as its first argument (649).

Removed
+++++++

- Removed ``require_config_value`` template filter (649).
- Removed configuration key 'flow.import_packaged_environments' (653).
- Removed configuaration key 'flow.environment_modules' (651).

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Added
+++++

- Added support to run aggregate operations in parallel (642, 644).
- Added an argument, ``run_options``, to ``FlowProject.make_group`` which allows passing options to ``exec`` for operations running in a different process (650).

Changed
+++++++

- Deprecated configuaration key 'flow.environment_modules' (651).
- Deprecated configuration key 'flow.import_packaged_environments' (651).
- Changed argument ``options`` to ``submit_options`` in ``FlowProject.make_group`` (650).

Removed
+++++++

- Dropped support for cloudpickle versions below `1.6.0` (644).
- Removed upper bound on ``python_requires`` (654).

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Changed
+++++++

- Dropped support for `tqdm <https://github.com/tqdm/tqdm>`__ versions older than `4.60.0` (#614).
- Renamed hook triggers `on_finish` to `on_exit` and `on_fail` to `on_exception` (612, 627).

Fixed
+++++

- Progress bars shown in notebooks fall back to text-based output if ipywidgets is not available (602, 614).

Removed
+++++++

- Internal utility functions have been removed from the public API (615).
- Dropped support for Python 3.6 and Python 3.7 following the recommended support schedules of `NEP 29 <https://numpy.org/neps/nep-0029-deprecation_policy.html>`__ (#628).
- Dropped support for `Jinja2 <https://palletsprojects.com/p/jinja/>`__ versions below `3.0.0` (#628).