expose FF epix100 to xfel-calibrate CLI

src/xfel_calibrate/notebooks.py

@@ -234,6 +234,12 @@ notebooks = {
                             "use function": "balance_sequences",
                             "cluster cores": 4},
         },
+        "FF": {
+            "notebook": "notebooks/ePix100/Characterize_FlatFields_ePix100_NBC.ipynb",
+            "concurrency": {"parameter": None,
+                            "default concurrency": None,
+                            "cluster cores": 4},
+        },
     },
     "EPIX10K": {
         "DARK": {