Initialise module parameters at instantiation
In order to speed-up module re-use, get the module needs (ssp, filters...) out of pcigale database at module instantiation instead of doing this everytime "process" is called. To do that: - we must give the module parameters (and proceed with their checking) at module instantiation. - we must add the possibility for each module to have its own initialisation code. In addition, to create the configuration file, we must be able to load the modules without any parameter to query them for their parameter list. The bc03, dh2002 and m2005 modules were changed to use this new behavior.