better way to handle mpi

params.yml

@@ -96,6 +96,8 @@ out: # Parameters for post processing
 process: # General setting of the post-processor module
     verbose : True                     # Give more infos on what is going on
     num_process : 1                    # Number of forks
+    mpi         : False                # If available, use mpi4py
+    allow_error : False                # Catch all errors in rules involving the disk
     save_cells : True                  # Save cells structure on disk
     save_parts : True                  # Save particles on disk
     unload_cells : True                # Save memory usage
@@ -105,6 +107,7 @@ rules: # Specific rules parameters
 
 
 astrophysix: # Parameters for astrophysix and galactica
+    generate          : False              # Whether to generate astrophysix objects
     simu_fmt          : "{tag}_{run}"      # Format of the name of simulation
     descr_fmt         : "{tag}_{run}"      # Format of the default description
     # The following keys are accepted