[plotter] add generic plot_map rule

plotter.py

@@ -5,7 +5,7 @@ This software is a helper to use pysmes tools to read and analyse RAMSES Outputs
 It's a rule based interface.
 This is the plotter module.
 
-@author Noé Brucy 2019-2020
+@author Noé Brucy 2019-2021
 """
 
 import os
@@ -1267,6 +1267,9 @@ class Plotter(Aggregator, BaseProcessor):
             "plot_snapshot": PlotRule(
                 self, lambda arg, **kwargs: self._plot(*arg, **kwargs)
             ),
+            "plot_map": PlotRule(
+                self, lambda mapname, **kwargs: self._plot_map(mapname, **kwargs)
+            ),
             "coldens": PlotRule(
                 self,
                 partial(