Have dilate use the util get2d function
Refer the functions from the util namespace
Implement the erode function
Remove unused helper function
Implement opening and closing functions in terms of dilate and erode
Add some tests for the binary morphology operations
Add a function for getting all pixels as a binary image
Add set-all-pixels and set-all-pixels-binary
Fixup to get-all-binary
Finish implementing binary morphological filtering
Add a function for making box structural elements
Stub out functions to make disk and ring structural elements
Add a function for creating a custom structural element