add example of drawing a cylindrical loop

(mostly so I think of this when I work on alignment in the future)
robx · May 2, 2019 · 1d8bacf · 1d8bacf
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diff --git a/tests/examples/cylinder.png b/tests/examples/cylinder.png
diff --git a/tests/examples/cylinder.pzg b/tests/examples/cylinder.pzg
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+- type: grid
+  style: dashed
+  grid: |2
+     ...
+     ...
+     ...
+- type: edges
+  grid: |
+    . . . . . .
+     o-o-o o-o
+         | |
+     o o-o o o
+       |   |
+     o o-o-o o
+    . . . . . .
+  substitute:
+    '-': sol-edge-horiz
+    '|': sol-edge-vert
+    'o': .