Source:

https://gitlab.eumetsat.int/open-source/data-tailor/-/blob/d1115baf74d6ce9eb41189264d73fee175826383/epct/epct/resources/eps_iasil1c_9a_custom.xml

Apache License 2.0

Started refactoring the AVHRR L1b EPS reader in preparation for the
IASI L2 EPS reader.  Replaced the wrong XML format definition by the
correct one.

Source for the EPS IASI L2 format definition is eugene.  After
installing eugene with ``mamba install -c eumetsat eugene``, I found the
definition file at ``envs/py311/share/eugene/formats/eps_iasil2_9.0.xml``.

For the XML format specification, add missing type configurations to
xmlformat.py.  Also uncomment parameter definitions from the XML
definition, which are needed to interpret the rest of the file.  I don't
know why those were commented out.

Change the distribution of responsibility between EPSBaseFileHandler and
EPSAVHRRFile.  Added a tests for xmlformat.process_array.

In xmlformat, collect a mapping of variable names against dimension names.

Turn xmlformat.parse_format from a module level function to a method on
XMLFormat.  Remove the module level dictionary VARIABLES and make this
an instance attribute on the XMLFormat class.

Take the IASI L2 EPS reader from EUMETSAT and integrate into Satpy.
The code was obtained from
https://gitlab.eumetsat.int/open-source/data-tailor-plugins/epct_plugin_gis
where it is licensed under the Apache License Version 2.0, January 2004.
It was developed by B-Open Solutions srl for EUMETSAT under contract
EUM/C0/17/4600001943/0PN and is Copyright (c) 2017-2022 EUMETSAT.
To the best of my knowledge, the Apache License allows for its
integration into GPL code.

Prior to speeding up the reading, improve tests to test actual values to
be read.

When reading grh, support interpreting a memmap.

Remove more dead code and change the sample data used for
test_eps_native_reader.  Change the expected results accordilgny.

In the dynamic available datasets for the iasil2snd reader, don't add
coordinates to variables that don't have corresponding dimensions.

Add safeguards in the IASI native reader to avoid going into infinite
loops

Remove implementation attempts that didn't work, restoring those files.