Remove provision for importing this module

I do not really see the point any longer of importing this module
instead of running it as a script.

Analysis/mat_to_shapefiles.py

@@ -9,6 +9,9 @@
 import shapefile
 import numpy as np
 from os import path
+import sys
+import scipy.io as sio
+import datetime
 
 def write(matlab_data, eddy_orientation, SHP_triplet, date_index):
     """matlab_data is a dictionary. matlab_data[eddy_orientation] is a
@@ -83,15 +86,10 @@ def write(matlab_data, eddy_orientation, SHP_triplet, date_index):
             polyline = np.stack((eddy[8], eddy[9]), axis = 1)
             w_max_speed.poly([polyline])
 
-if __name__ == "__main__":
-    import sys
-    import scipy.io as sio
-    import datetime
-    
-    if len(sys.argv) != 2: sys.exit("Required argument: .mat file")
-    matlab_data = sio.loadmat(sys.argv[1], squeeze_me = True)
-    date_index = datetime.date.fromordinal(matlab_data["date_num"] - 366) \
-        - datetime.date(1950, 1, 1)
-    date_index = date_index.days
-    write(matlab_data, "Anticyclonic_Cell", "Snapshot_anti", date_index)
-    write(matlab_data, "Cyclonic_Cell", "Snapshot_cyclo", date_index)
+if len(sys.argv) != 2: sys.exit("Required argument: .mat file")
+matlab_data = sio.loadmat(sys.argv[1], squeeze_me = True)
+date_index = datetime.date.fromordinal(matlab_data["date_num"] - 366) \
+    - datetime.date(1950, 1, 1)
+date_index = date_index.days
+write(matlab_data, "Anticyclonic_Cell", "Snapshot_anti", date_index)
+write(matlab_data, "Cyclonic_Cell", "Snapshot_cyclo", date_index)