optimize hog
revise accuracy and perf tests
revise ocl samples, add tvl1 sample
Make version-related test properties more useful.

Namely, normalize their names to a common convention and remove useless text
from their values.
a bug fix in stereo_match sample
Merge pull request #1026 from SpecLad:ts-version-prop
Merge pull request #1022 from bitwangyaoyao:2.4_hog
Merge pull request #1025 from bitwangyaoyao:2.4_tests