Resolve "In painting has different output based on computer OS"

Closes #2 (closed)

As discussed in #2 (closed), small differences coming from difference linear algebra libraries can be amplified during further computation (especially in uint8 precision) and lead to slightly different output on different systems. This is not something that can be easily worked around, therefore the chosen solution is to increase the tolerance of the unit tests to allow for these small modifications.

bob/ip/stereo/test/test.py

@@ -55,7 +55,7 @@ def canberra_distance(array1, array2):
 
     return np.sum(
         np.abs(array1.astype(np.float64) - array2.astype(np.float64))
-        / (np.abs(array1.astype(np.float64)) + np.abs(array2.astype(np.float64)))
+        / (np.abs(array1.astype(np.float64)) + np.abs(array2.astype(np.float64) + 1.0))
     )