Use method `ishape_range` in `select_ishapes`

Use method `ishape_range` in function `select_ishapes`.

Inst_eddies/Analysis/plot_eddy_contours.py

@@ -31,27 +31,21 @@ def select_ishapes(d, SHPC, i_slice, orientation, window = None):
 
     """
 
-    ishape_first = SHPC.comp_ishape(d, eddy_index = 1, i_slice = i_slice,
-                                    orientation = orientation)
-    try:
-        ishape_last = SHPC.get_ishape_last(i_slice, orientation)\
-            [d - SHPC.d_init[i_slice]]
-    except TypeError:
-        ishape_list = []
+    ishape_list = SHPC.ishape_range(d, i_slice, orientation)
+
+    if window is None:
+        ishape_list_filt = ishape_list
     else:
-        if window is None:
-            ishape_list = list(range(ishape_first, ishape_last + 1))
-        else:
-            ishape_list = []
-            reader = SHPC.get_reader(i_slice, layer = "extremum",
-                                     orientation = orientation)
+        ishape_list_filt = []
+        reader = SHPC.get_reader(i_slice, layer = "extremum",
+                                 orientation = orientation)
 
-            for ishape in range(ishape_first, ishape_last + 1):
-                points = reader.shape(ishape).points[0]
-                if util_eddies.in_window(points, window):
-                    ishape_list.append(ishape)
+        for ishape in ishape_list:
+            points = reader.shape(ishape).points[0]
+            if util_eddies.in_window(points, window):
+                ishape_list_filt.append(ishape)
 
-    return ishape_list
+    return ishape_list_filt
 
 def snapshot(ax, ishape_list, SHPC, i_slice, orientation, *, dashed = False,
              light = False, src_crs = ccrs.PlateCarree()):