add matplotlib font-manager .json def. file

.gitignore

-# /
+# General
+*.log
+instances/
+
+# Specs
 /playground
 src/__pycache__/

analysis/opmd_analyser.py

@@ -245,8 +245,8 @@ def analyze():
         
         if 0 == comm.rank:
             # Viz. packages 
-            #import matplotlib
-            #matplotlib.use('Agg')
+            import matplotlib
+            matplotlib.use('Agg')
             import matplotlib.pyplot as plt
             plt.switch_backend('agg')
             from matplotlib.colors import LogNorm