Added "noisy" version of 6-sided hole

Meshes/Hole_6_noise.ply

@@ -0,0 +1,58 @@
+ply
+format ascii 1.0
+element vertex 36
+property float x
+property float y
+property float z
+element face 13
+property list uchar int vertex_index
+end_header
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+-0.5	 2.60	-0.5
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+-2.25	 1.30	-0.75
+ 2.25	 1.30	-0.75
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+-1.5	 0.87	-0.1
+ 1.5	 0.87	-0.1
+ 2.5	 0.87	-0.5
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+-2	 0   	 0.5
+ 2	 0   	 0.5
+ 3	 0   	 0
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+-1.5	-0.87	 0
+ 1.5	-0.87	 0
+ 2.5	-0.87	 0
+-2.25	-1.30	 0
+ 2.25	-1.30	 0
+-2	-1.73	 0
+-1	-1.73	 0.25
+ 0	-1.73	 0
+ 1	-1.73	 0.25
+ 2	-1.73	 0
+-1.5	-2.60	-0.75
+-0.5	-2.60	-0.25
+ 0	-2.60	 0
+ 0.5	-2.60	-0.25
+ 1.5	-2.60	-0.75
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