Merge branch 'fix-beam_ion_monitor' into 'develop'

[fix] IonMonitor mp_number attribute

See merge request !41

mbtrack2/tracking/beam_ion_effects.py

@@ -68,7 +68,7 @@ class IonMonitor(Monitor, metaclass=ABCMeta):
             "mean": (4, total_size),
             "std": (4, total_size),
             "charge": (total_size, ),
-            "mp_number": (buffer_size, ),
+            "mp_number": (total_size, ),
         }
         self.monitor_init(group_name, save_every, buffer_size, total_size,
                           dict_buffer, dict_file, file_name)