BC03: add old + young mass parameters to the SED

In the Bruzual and Charlot (2003) SSP module, we add parameters to the
info dictionary containing the total star and gas masses for the galaxy.

pcigale/creation_modules/bc03.py

@@ -125,6 +125,13 @@ class BC03(CreationModule):
         sed.add_info("stellar.b4_sdss_old", old_info["b4_sdss"])
         sed.add_info("stellar.b_912_old", old_info["b_912"])
 
+        sed.add_info("stellar.m_star",
+                     young_info["m_star"] + old_info["m_star"],
+                     True)
+        sed.add_info("stellar.m_gas",
+                     young_info["m_gas"] + old_info["m_gas"],
+                     True)
+
         sed.add_info("galaxy_mass", 1., True)
 
         sed.add_contribution("stellar.old", old_wave, old_lumin)