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Store the name of the individual lines in the database in order so they can easily be identified and retrieved.

Fν was computed by calculating Fλ and then converting to Fν, which led to typical differences in fluxes of typically 1-2% and a bit more for a handful of pathological filters. Now Fν is computed directly and a bit faster. At the same time rather than computing an effective wavelength (which was more a mean wavelength), we compute the pivot wavelength, which is more appropriate when converting between Fν and Fλ.

Do not store anymore the filter type as all the filters are now assumed to be in units of energy. The conversion from photon to energy is carried out by the import procedure as needed.

Implement the computation of the mass-weighted age for the bc03 and m2005 module. This is done in the corresponding convolve() functions. The information is returned in a new variable called info_all, which also contains all the information when the entire SFH is included (rather than separating old and young populations).

Rather than calling convolve() twice, call it just once with the separation age as an argument et let it do the various different convolutions. While this is functionally equivalent, this allows to pass the full SFH to convolve(), which in turn is necessary to compute additional quantities. This patch is a preparatory work for the the implementation of mass-weighted ages.

Do not return the break strengths in the bc03 module as they are not computed corrected by a convolvution.

There is no need to return the wavelength grid after convolution in the data bc03 module, it is readily available in the bc03 sed module.

Homogenise the bc03 and m2005 data modules so they use the same variable names as far as possible. Comments have also been corrected and made consistent.

We do not store the time grid in the SED anymore given that we assume it starts at 0 Myr with steps of 1 Myr, we can easily reconstruct to save it if needed. It should save a little bit of memory and it should go a little bit faster.

For convenience the time grids start at 0. Howver the SSP grids start at 1. This  offset means that the oldest bin in an SFH is set to 0, for both the young and old components. Now rather than trying to interpolate the SFH time grid on the SSP time grid, we rely on the fact that the SFH time grid starts from 0, so it is easy to know which SSP to select (as many as the number of steps). Also adapt the sfh_buat08 module.

Speedup the construction of the database. One of the issues is that models where inserted and committed one by one, which is very slow with SQLite. Now we rather insert all the models at once (for instance all the DL07 models) and commit only when this is done. Even on an SSD, the total run time of python setup.py build goes from 5m20s to 2m42s. The speedup should be even more spectacular on a rotating hard drive.

First implementation of a script to list, add, remove, and plot the filters in the pcigale database. One or more filters can be added, removed, or plotted in one command.

Simplify a bit the code by removing the normalisation option from the convolve procedure as it duplicates the functionality from the SFH modules.