* round doesn't exists in standard library of Visual Studio 2012
  * apply the correct computation of ROI

- avoid unnecessary rebuilding of OpenCV libraries
- use timestamp of the first launch of CMake
- to return to previous behavior use `-UOPENCV_TIMESTAMP` CMake option

Implementation of bit-exact resize. Internal calls to linear resize updated to use bit-exact version. (#9468)

Introduce CMake variable OPENCV_MAP_IMPORTED_CONFIG which controls this behaviour
Added defaults for MSVS targets

  * stop re-enabling the warning C4127
  * disabling is done in CMakeLists.txt

CMake message contains this: "Invalid escape sequence \"

- CV_L2 -> relative NORM_L2
- eigenEps: 1e-6 ==> 1e-4
- evalEps: 1e-6 ==> 1e-5
- evecEps: 1e-3 ==> 5e-3
- RNG seed: 12345
- drop non-informative legacy test code (ts->printf, etc)