Rename `e_max` to `e_overestim`

Clearer. `e_max` is now the number of eddies of the current
orientation at the current date. See documentation.

Convert_Matlab/convert_id.py

@@ -13,6 +13,6 @@ def convert_id(node_index):
     shapefiles.
 
     """
-    k = (node_index - 1) // e_max
-    eddy_index = node_index - k * e_max
+    k = (node_index - 1) // e_overestim
+    eddy_index = node_index - k * e_overestim
     return date_index(date_num[k]), eddy_index

Convert_Matlab/overlap_v6.py

@@ -17,8 +17,8 @@ n_eddies = sio.loadmat(f"N{orientation}.mat", squeeze_me = True)\
     [f"N{orientation}"].astype(int, casting = "safe", copy = False)
 n_dates = n_eddies.size
 print("n_dates =", n_dates)
-e_max = id_child.shape[0]
-print("e_max =", e_max)
+e_overestim = id_child.shape[0]
+print("e_overestim =", e_overestim)
 
 with open(f"edgelist_{orientation}.csv", "w", newline = '') as edgelist:
     writer = csv.writer(edgelist, delimiter = ' ', lineterminator = "\n")
@@ -26,7 +26,7 @@ with open(f"edgelist_{orientation}.csv", "w", newline = '') as edgelist:
 
     for k1 in range(n_dates):
         for i1, id_child_1 in enumerate(id_child[:n_eddies[k1], k1]):
-            n1 = k1 * e_max + i1 + 1
+            n1 = k1 * e_overestim + i1 + 1
             # id_child_1 may be an int, which means there is a single
             # successor, or id_child_1 may be a numpy array, which means
             # there are several successors.