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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.

Instead of prefixing the key in the SED with the module name, we postfix
them with the same postfix as the module name if any. This makes easier
to inter-change modules adding the same information (for instance
attenuation modules adding the attenuation value).
That implies that when using several modules adding the same
information, one must postfix the name of each.

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

The process method was used to complete and check the parameter
dictionary before launching the _process one defined in each module. Now
that the parameters are dealed with at instantiation, this separation is
no more useful.

Also, modify the attenuation modules to read the filter in the database
at instantiation.

s/[Pp]arametre/[Pp]arameter/g
s/[Dd]ictionnary/[Dd]ictionary/g

Suppress the 'unit' part of the tuple associated to each parametre
in the parametre_list dictionary of the SED modules. It's not
useful. It's better to indicate the unit in the description text.

The modules can now be named with any prefix using a dot (e.g.
dh2002_ir.1). That means that a 'pristine' module can't have a dot in
it's name.

The add_component SED method was removed. To add components to a sed,
add_info, add_module (NEW) and add_contribution (NEW) must be used.

The modules now add more information in the sed info dictionary, even
the parametres that can be used for the statistical analysis. In
particular, mh2005_sfh add the SFR and the average SFR.

The sfr variable was renamed to sfh.