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

Use sphinx with astropy _templates (it would be great to make pcigale an
affilated package).
Make the skeleton of the documentation.
Start to write pcigale script usage.

We follow the astropy version number scheme VERSION-RELEASE.

Take the Maraston 2005 models from the right page (see Readme.rst). The
one we were using come from an old (but still alive) page and the Kroupa
half solar metallicity SSP had a problem that was corrected around 2011.

Also, we keep all the unused SSP in the "not_in_base" folder.

In Maraston 2005 module, use Z value for metallicity (instead of
log10[Z/H]) and homogenise IMF name with BC03 ones.

PEP8-fication of the code and correction of various typos and spelling
mistakes.

If the SED is redshifted, apply the redshift before checking the
boundaries.

Prepare to make it possible to get the flux in a filter without taking
into account the contribution from the spectral lines.

Store the spectral lines in the SED as a three axis numpy array and add
a method to add new sets of lines.

Add the necessary structures and methods to add and retrieve them from the
database.

The redshifting also lower the fluxes (that's different from the
cosmological dimming).
Also, simplify some methods.