calib3d: revert stereoRectify() changes from PRs: 6836, 6972, 6955
(1/4) Revert "Correct image borders and principal point computation in cv::stereoRectify"
This reverts commit
93ff1fb2f21a552c258fc2e9f7973f7d5b159cfc.
(2/4) Revert "fix calib3d changes in 6836 plus some others"
This reverts commit
fa42a1cfc2b0fce1d807f18f0ea26ba1e5753b80.
(3/4) Revert "fix compiler warning"
This reverts commit
b3d55489d3f1bd2eab0c1e3ad56d8f17d4f447e9.
(4/4) Revert "add test for 6836"
This reverts commit
d06b8c4ea9d30be7f60196cdf3c9a65f64370fa4.