Update TODO

TODO.rst

 * Check the age of the Universe at observation redshift.
 * Deal with observation without values in some filters.
-* Code ISM effect module.
-* Code AGN module.
-* Make the ISM effect a module separated from the main SED creation modules
-  and applied according to the redshift of the observation.
-* Make the ISM module work with a list (or range) of redshift to allow the
-  use of pcigale to compute photometric redshifts.
 * Code the theoretical SED serialisation and the database to store them.
-* Write documentation.
 * When a default parameter is an array, use the "eval ..." the the generated
   ini file.
 * Change metallicity numbering (ex. 0.02 for solar).
+* Code the creation of mock catalogues.
+* Create some plot to check the fit quality:
+  - plot giving for each band the ratio between the observed flux and the best
+    sed flux.
+  - colour plots (colours chosen by the user) comparing the colour ranges
+    covered by the simulation and the colours of the observed galaxies.)
+* Write documentation.
+* Code IGM effect module.
+* Make the IGM effect a module separated from the main SED creation modules
+  and applied according to the redshift of the observation.
+* Make the IGM module work with a list (or range) of redshift to allow the
+  use of pcigale to compute photometric redshifts.