Create CMake file for tests
Export dummy test files for each operator, build tests
Export empty but complete operator test
Export test functions for each option
Start to work on test system
Create test data
Obtain operator outputs
Get output from operator in operator test
Automatically expand default test data
Write result images
Support loading grayscale images
Replicate non-opencv operators in new package imgutil
Link OpenCV wrappers against imgutil instead of example
Fix documentation
Add python wrapper for imgutil
Add python wrapper for imgutil::Matrix
Refactor python submodule entry