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Modification to savefluxes to have all the contenct of the sed.info
dictionary in the output table. That means that all the SED created with
the modules must have the same sed.info keys.

Move the igmattenuation module and its LSST dependencies inside the psum
analysis module.
Remove the redshift_module and redshift_configuration parts of the
configuration file.

Now the redshift is an attribute of the SED.

The SED.compute_fnu() no longuer takes redshift and apply_redshift
arguments as the SED is supposed to be redshifted.

The SED.lambda_fnu() method was converted to the SED.fnu property
returning th Fν flux density at each wavelength of the wavelength grid.

Remove the author email addresses from the source files and add a AUTHORS.rst
file with the addresses and current affiliation to make it easier to update
the information.

Also, give copyright to the University of Cambridge and the University of
Crete for code developed by authors working there.

It will make the documentation clearer.

For the creation and analysis modules, move the contents of the
common.py files to the __init__.py.

Move the SED creation modules to pcigale.creation_modules to be more
consistent with the analysis module location.

Also warn the user when an output was renamed.

For redshift and analysis module, we don't need to evaluate each
parameter as an array as we don't expect arrays here (and that force us
to use parameter[0] to get the value).

Configobj return strings, to evaluate the booleans on their "string"
content.

So that the configuration files and the serialized data have a logical
order.