[params] Now use default value if not in the param file

params.py

@@ -26,11 +26,18 @@ _loader.add_implicit_resolver(
 )
 
 
-def load_params(filename):
+def params_from_file(filename):
     with open(filename) as f:
         para_disk = yaml.load(f, Loader=_loader)
     return munch.munchify(para_disk)
 
 
 def default_params():
-    return load_params(_dir_path + "/params.yml")
+    return params_from_file(_dir_path + "/params.yml")
+
+
+def load_params(filename):
+    basic_params = default_params()
+    new_params = params_from_file(filename)
+    basic_params.update(new_params)
+    return basic_params

params.yml

@@ -53,7 +53,7 @@ pymses: # Parameters for Pymses reader
     # Processing options
     levelmax : 20                      # Maximal AMR level visited when looking levels
     fft      : False                   # Quick and dirty rendering using FFT
-    verbose  : True                    # Let pymses write on standart output
+    verbose  : False                    # Let pymses write on standart output
     multiprocessing : True             # Whether to use multiprocessing
 
     # Camera settings
@@ -90,7 +90,7 @@ out: # Parameters for post processing
 
 
 process: # General setting of the post-processor module
-    verbose : False                    # Give more infos on what is going on
+    verbose : True                     # Give more infos on what is going on
     num_process : 1                    # Number of forks
     save_cells : True                  # Save cells structure on disk
     save_parts : True                  # Save particles on disk