Fastspecfit

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* Support non-DR9 photometry via a new photometric configuration file [`PR 133`_].
* Miscellaneous updates and bug fixes ahead of next version of VACs [`PR 145`_].

.. _`PR 133`: https://github.com/desihub/fastspecfit/pull/133
.. _`PR 145`: https://github.com/desihub/fastspecfit/pull/145

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* Allow the Redrock redshift to be overridden [`PR 115`_].
* Code to support fitting stacked spectra [`PR 116`_].
* Bug fix of reversed tied flux ratio of [OII]7320,7330 doublet [`PR 120`_].
* Do not constrain the SPS age by default [`PR 132`_].
* Bug fix of emission-line subtracted Dn(4000) measurement [`PR 135`_].
* Update IGM attenuation coefficients [`PR 136`_].
* Several significant changes [`PR 137`_]:

* Record the observed-space emission-line amplitude in ``_AMP`` and move the
model-space amplitude to ``_MODELAMP``.
* Demand at least 12 pixels to measure the scatter in the pixels under the
line (therefore ``_AMP_IVAR`` should be more reliable for narrow lines).
* Major bug fix whereby the model emission-line spectra were not being
convolved with the resolution matrix.
* Redefine ``_CHI2`` for an emission line as the observed not reduced chi2.
* Switch from (deprecated) ``pkg_resources`` to ``importlib``.
* Updated documentation (data model) and several non-negligible speed-ups.

* Improved modeling of galaxies with broad+narrow line-emission [`PR 142`_]:

.. _`PR 115`: https://github.com/desihub/fastspecfit/pull/115
.. _`PR 116`: https://github.com/desihub/fastspecfit/pull/116
.. _`PR 120`: https://github.com/desihub/fastspecfit/pull/120
.. _`PR 132`: https://github.com/desihub/fastspecfit/pull/132
.. _`PR 135`: https://github.com/desihub/fastspecfit/pull/135
.. _`PR 136`: https://github.com/desihub/fastspecfit/pull/136
.. _`PR 137`: https://github.com/desihub/fastspecfit/pull/137
.. _`PR 142`: https://github.com/desihub/fastspecfit/pull/142

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* Web-app updates needed for Fuji/v2.0 database load [`PR 107`_].
* Get target cutouts using image coadds on-disk [`PR 108`_].
* Initial hooks to fit stacked spectra [`PR 113`_].
* Updated documentation for v2.0 Fujilupe and v1.0 Iron VACs [`PR 114`_].

.. _`PR 107`: https://github.com/desihub/fastspecfit/pull/107
.. _`PR 108`: https://github.com/desihub/fastspecfit/pull/108
.. _`PR 113`: https://github.com/desihub/fastspecfit/pull/113
.. _`PR 114`: https://github.com/desihub/fastspecfit/pull/114

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* Be robust to synthesizing photometry of the highest-redshift targets [`PR 101`_].
* Fix another corner-case crash to the highest-redshift targets [`PR 102`_].
* Do not crash if there are no lines to optimize [`PR 104`_].

.. _`PR 101`: https://github.com/desihub/fastspecfit/pull/101
.. _`PR 102`: https://github.com/desihub/fastspecfit/pull/102
.. _`PR 104`: https://github.com/desihub/fastspecfit/pull/104

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* Tests, bug fixes, and speed-ups of version 2.0.0 [`PR 99`_].

.. _`PR 99`: https://github.com/desihub/fastspecfit/pull/99

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* Support custom coadds, update laboratory line-wavelengths, and fix major EW
bug [`PR 87`_].
* Refactor fitting engine to not use fnnls or astropy.modeling [`PR 92`_].
* Additional Fujilupe documentation [`PR 93`_].
* Webapp updates to support latest data model [`PR 94`_].
* Joint spectrophotometric fitting and much more [`PR 95`_].
* Additional fujilupe v2.0 updates [`PR 96`_].

.. _`PR 87`: https://github.com/desihub/fastspecfit/pull/87
.. _`PR 92`: https://github.com/desihub/fastspecfit/pull/92
.. _`PR 93`: https://github.com/desihub/fastspecfit/pull/93
.. _`PR 94`: https://github.com/desihub/fastspecfit/pull/94
.. _`PR 95`: https://github.com/desihub/fastspecfit/pull/95
.. _`PR 96`: https://github.com/desihub/fastspecfit/pull/96