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Import Iterable from collections.abc rather than from collections in order to prevent ImportError/AttributeError exceptions with Python 3.10+.

Revert "Partially revert "Import changes from commit 3d1c0d76 so that pcigale is installable (credits Yannick Roehlly).""

This reverts commit 6b82dbe3.

This reverts commit 3fb010a6.

Partially revert "Import changes from commit 3d1c0d76 so that pcigale is installable (credits Yannick Roehlly)."

This reverts commit 00d3c2ff.

When running pcigale init several times with an existing pcigale.ini, the top comment was repeatedly included due to the default behaviour of configobj

Emit an exception when generating the pcigale.ini file the m2005 in case it is used in combination with the nebular and/or xray modules.

Create a Plotter class and make the different plot types use it. It allows to remove quite a bit of duplication between the different plot types. As it rewrites most of the files, reformat the files with Black.

Fix pcigale-plots when using the spawn starting method. See commit 499da45a for pcigale.

Eliminate Configuration.check_modules() as it is now redundant with the functionality brought by the Info class.

Add a new Info class to gather and print 1) information about cigale and the machine (cigale version, python version, and platform), 2) summary information about the run (input file names, number of objects, redshift range, number of models, band and properties to, fit number of cores, analysis module), and 3) the module used for each SED component.

Add a __category__ attribute to the SED modules. This is necessary to allow for the dynamic registration of each module, eliminating the need to maintain an explicit list of modules for each component. Modules lacking this attribute will not be registered.

Add a __version__ attribute to the pcigale module and have setup.py use that version, which is defined in pcigale/version.py.

Determine the intrinsic UV slope β₀ at the same time as the observed UV slope β. To compensate for the additional time spent, the computation of the slope is optimized.

Temporarily remove the counter sub-process that updates the progress bar as it cannot be pickled when creating the parallel processes when using the spawn starting method. After the parallel processes have exited, it can be restored.

Apply the same constraints to the multiprocessing processes start method and python version to pcigale-plots as for pcigale

The terminal output has been completely reworked. The level of importance of the messages are now stated (INFO, WARNING, ERROR). Progress bars have been added, indicating the total number of items processed, the number of items processed per second, the elapsed time, the remaining time. Colours are used to improve the legibility of the information.