**Added rendering of tag tourism=wilderness_hut**

Rebase to master
Removed usage of shelter_type which can be reintroduced when hstore is available
Removed basic_hut.svg to be used with shelter_type
Added specific symbol for wilderness_hut vs. generic amenity=shelter.

To summarize, the following different kind of huts have specific symbols now:

- amenity=shelter (only shown at zoom >=16)
- tourism=alpine_hut  (not modified within this drop)
- tourism=wilderness_hut (zoom>=13)

alpine_hut: symbols/alpinehut.p.16.png
wilderness_hut: symbols/wilderness_hut.svg
generic shelter: symbols/shelter-14.svg

Drop revised as requested

- Revised wilderness_hut.svg substituting lines & strokes to paths in order to avoid marker-line-color which is not supported in old versions of Mapnik
- Removed fill color from  wilderness_hut.svg so that the color is done in amenity-points.mss
- Newline at the end of wilderness_hut.svg
- Tab removed from amenity-points.mss
- Set min zoom for text to z14 (same as tourism=alpine_hut)
- Rebased

amenity-points.mss

@@ -30,8 +30,14 @@
     point-placement: interior;
   }
 
+  [feature = 'tourism_wilderness_hut'][zoom >= 13],
   [feature = 'amenity_shelter'][zoom >= 16] {
     marker-file: url('symbols/shelter-14.svg');
+    [feature = 'tourism_wilderness_hut'] {
+      marker-file: url('symbols/wilderness_hut.svg');
+      marker-width: 15;
+      marker-height: 13;
+    }
     marker-fill: @transportation-icon;
     marker-placement: interior;
     marker-clip: false;
@@ -1712,6 +1718,7 @@
   [feature = 'tourism_hostel'][zoom >= 17],
   [feature = 'tourism_chalet'][zoom >= 17],
   [feature = 'tourism_guest_house'][zoom >= 17],
+  [feature = 'tourism_wilderness_hut'][zoom >= 14],
   [feature = 'tourism_camp_site'][zoom >= 17] {
     text-name: "[name]";
     text-size: @standard-text-size;
@@ -2223,4 +2230,3 @@
     }
   }
 }
-