nb_proc read as int in jobs

sen2chain/jobs.py

@@ -355,7 +355,7 @@ class Job:
         except:
             self.provider = "peps"
         try:
-            self.nb_proc = parser["top"]["nb_proc"]
+            self.nb_proc = int(parser["top"]["nb_proc"])
         except:
             self.nb_proc = 8
         for i in range(1, 10):