Toast

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* Change way that the MPI communicator is passed to C++ (PR `309`_).

.. _`309`: https://github.com/hpc4cmb/toast/pull/309

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* Convert atmosphere simulation to new libaatm package (PR `307`_).
* Improve vector math unit tests (PR `296`_).
* Updates to conviqt operator (PR `304`_).
* Satellite example pipeline cleanups.
* Store local pixel information in the data dictionary (PR `306`_).
* Add elevation-dependent noise (PR `303`_).
* Move global / local pixel lookup into compiled code (PR `302`_).
* PySM operator changes to communicator (PR `301`_).
* Install documentation updates (PR `300`_, `299`_).

.. _`307`: https://github.com/hpc4cmb/toast/pull/307
.. _`296`: https://github.com/hpc4cmb/toast/pull/296
.. _`304`: https://github.com/hpc4cmb/toast/pull/304
.. _`306`: https://github.com/hpc4cmb/toast/pull/306
.. _`303`: https://github.com/hpc4cmb/toast/pull/303
.. _`302`: https://github.com/hpc4cmb/toast/pull/302
.. _`301`: https://github.com/hpc4cmb/toast/pull/301
.. _`300`: https://github.com/hpc4cmb/toast/pull/300
.. _`299`: https://github.com/hpc4cmb/toast/pull/299

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* Fix bug when writing FITS maps serially.
* Improve printing of Environment and TOD classes (PR `294`_).
* Fix a race condition (PR `292`_).
* Control the Numba backend from TOAST (PR `283`_, `291`_).
* Functional TOAST map-maker (PR `288`_).
* Large improvements to ground sim example (PR `290`_).
* Overhaul examples to match 2.3.0 changes (PR `286`_).
* Handle small angles and improve unit tests for healpix.

.. _`294`: https://github.com/hpc4cmb/toast/pull/294
.. _`292`: https://github.com/hpc4cmb/toast/pull/292
.. _`283`: https://github.com/hpc4cmb/toast/pull/283
.. _`291`: https://github.com/hpc4cmb/toast/pull/291
.. _`288`: https://github.com/hpc4cmb/toast/pull/288
.. _`290`: https://github.com/hpc4cmb/toast/pull/290
.. _`286`: https://github.com/hpc4cmb/toast/pull/286

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* Rewrite of internal compiled codebase and build system.
* Move common pipeline configuration to a new module (PR `280`_).
* Add scan synchronous simulation operator (PR `278`_).

.. _`280`: https://github.com/hpc4cmb/toast/pull/280
.. _`278`: https://github.com/hpc4cmb/toast/pull/278