Implement experimental SGM algorithms

lib/libstereo/CMakeLists.txt

lib/libstereo/include/stereo.hpp

lib/libstereo/include/stereo_types.hpp

lib/libstereo/middlebury/CMakeLists.txt

lib/libstereo/middlebury/algorithms.hpp

lib/libstereo/middlebury/main.cpp

lib/libstereo/middlebury/middlebury.cpp

lib/libstereo/middlebury/middlebury.hpp

lib/libstereo/src/aggregations/adaptive_penalty.hpp

lib/libstereo/src/aggregations/cp_sgm.hpp

lib/libstereo/src/aggregations/standard_sgm.hpp

lib/libstereo/src/algorithms/brefcensussgm.cu

lib/libstereo/src/algorithms/censussgm.cu

lib/libstereo/src/algorithms/excensussgm.cu

lib/libstereo/src/algorithms/hcensussgm.cu

lib/libstereo/src/algorithms/hstablesgm.cu

lib/libstereo/src/algorithms/hwcensussgm.cu

lib/libstereo/src/algorithms/meancensussgm.cu

lib/libstereo/src/algorithms/stablesgm.cu

lib/libstereo/src/algorithms/stereosgm.hpp