Change assumed directory structure

But we should find some way not to impose a directory structure to the
user.

gt_segmented_cf.py

@@ -137,7 +137,7 @@ ishape_last = {}
 shp_tr_dir = input('Directory containing %Y/SHPC_(anti|cyclo): ')
     
 for year in range(1993,2019):
-    shp_dir = path.join(shp_tr_dir, f'SHPC_{orientation}_{year}')
+    shp_dir = path.join(shp_tr_dir, f'{year}/SHPC_{orientation}')
     extremum[year] = shapefile.Reader(path.join(shp_dir, 'extremum.shp'))
     max_speed[year] = shapefile.Reader(path.join(shp_dir, 'max_speed_contour.shp'))
     ishape_last[year] = loadtxt(path.join(shp_dir, 'ishape_last.txt'),