[bin] Fix all the scripts that had errors

- `meshroom_submit`: the submission to the render farm is now effective
(the script did not work at all).
- `meshroom_status`: the `--toNode` option did not work and caused errors.
- `meshroom_statistics`: some adjustments needed to be made for the script
to run with Python3 instead of Python2, an issue in the core/stats.py file
led the `statistics` file to never being read correctly, and the calls
to the Matplotlib API were outdated.

bin/meshroom_statistics

@@ -3,7 +3,8 @@ import argparse
 import os
 import sys
 from pprint import pprint
-from collections import Iterable, defaultdict
+from collections import defaultdict
+from collections.abc import Iterable
 
 from meshroom.core import graph as pg
 
@@ -15,11 +16,11 @@ def addPlots(curves, title, fileObj):
     import matplotlib.pyplot as plt, mpld3
 
     fig = plt.figure()
-    ax = fig.add_subplot(111, axisbg='#EEEEEE')
+    ax = fig.add_subplot(111, facecolor='#EEEEEE')
     ax.grid(color='white', linestyle='solid')
 
     for curveName, curve in curves:
-        if not isinstance(curve[0], pg.basestring):
+        if not isinstance(curve[0], str):
             ax.plot(curve, label=curveName)
     ax.legend()
     # plt.ylim(0, 100)