CIGALE discards the negative fluxes.  We must reverse the pseudo filters
used for absorption line indices to produce positive fluxes.

Get rid of the array containing the redshifts of all the models. Now that we infer the redshift of individual models from the list of unique redshifts it is not needed anymore. This change saves 8 bytes per model. The code should be marginally faster too.

Version 0.8.0

In the attenuation modules, remove the attenuation.ebvs_main and
attenuation.ebvs_young parameter that are duplicates of
attenuation.E_BVs.stellar.old and attenuation.E_BVs.stellar.young.

Homogenise the outputs of the two modules and add the Av/E_BVs old
factors to the information dictionary so that their analysis can be
done.

When a best model is saved to a VO-table XML file, the SED information
and parameters stored in the file "headers" are now alphabetically
sorted.

The 0.7.1 got accidentally released with a bug in pcigale-plots and with a new feature. Not a good idea to have a minor version in that case. Let's remove 0.7.1 from history and let's call the fixed version 0.8.0.

When no dust emission module is used, pcigale genconf complains that no dust attenuation module is used. Correctly specify dust emission and not attenuation. Bug reported by Laure Ciesla.

Simplify and streamline the production of mock plots. Now just output one plot per file and do so in parallel. Also output in log when it seems to make sense.

When the flux file contains a mix of spaces and tabulations as column separators, pcigale discards the header and takes the first data line as the header. Now pcigale properly handles such a combination. Bug reported by Paola Santini.

Actually raise an exception indicating to the users to change their
parameters if the quenching age happens to be superior to the galaxy
age.

Fixes #2

A dummy parameter was used in param because a parameterless module is
not possible.  Now that we have the list of filters, we can remove it.

Using the param module, if the list of filters is empty, no flux will be
computed and the module won't complain about '' missing filter.  Also,
switch the default value for this list of filters to the empty string,
because None means that there is no default value which makes the module
not usable without the list for filters parameters.

Closes #5

The luminosity table is also used when plotting Fluxes to access the
various components.