Make kvz_calc_sao_offset_array more obvious
Make kvz_calc_sao_offset_array more obvious

Name temporary values from array lookups etc that are referred multiple
times to, to make the behavior of the mechanism more transparent. Define
all the constant values at the beginning of the function and declare as
const.

ultravideo/kvazaar,ultravideo/kvazaar,ultravideo/kvazaar,ultravideo/kvazaar,ultravideo/kvazaar