Rename function `make_animation` to `anim_eddies`

`make_animation` seems too general, the reader may think it is an
object of Matplotlib.

Inst_eddies/Analysis/anim_eddy_contours.py

@@ -33,8 +33,8 @@ def func(d, ax, ishape_lists, readers, bbox, light):
     ax.coastlines()
     ax.set_title(f"d = {d}", y = 1.05)
 
-def make_animation(fig, ax, d_init, ishape_last, readers, window, d_min, d_max,
-                   light):
+def anim_eddies(fig, ax, d_init, ishape_last, readers, window, d_min, d_max,
+                light):
     ishape_lists = {d: plot_eddy_contours.select_ishapes(d, d_init, ishape_last,
                                                          readers["extremum"],
                                                          window)
@@ -86,9 +86,9 @@ if __name__ == "__main__":
     fig = plt.figure()
     projection = ccrs.PlateCarree()
     ax = plt.axes(projection = projection)
-    ani = make_animation(fig, ax, d_init, ishape_last, readers,
-                         window = args.window, d_min = args.d_min,
-                         d_max = args.d_max, light = args.light)
+    ani = anim_eddies(fig, ax, d_init, ishape_last, readers,
+                      window = args.window, d_min = args.d_min,
+                      d_max = args.d_max, light = args.light)
     ani.save("eddy_contours.gif", writer  = "imagemagick")
 
     pygifsicle.gifsicle("eddy_contours.gif",  options = ["--no-loopcount"])