* Update demosaicing.cpp

Fixed calculation of Bs for non-green pixels.

* Fixed cvtColor perf test for bayer VNG

* Support for several min and max sizes in PriorBox layer

* Fix minSize

* Check size

* Modify initInfEngine

* Fix tests

* Fix IE support

* Add priorbox test

* Remove inputs

OpenCV 3.4.7

* Unroll multiply and add instructions in dotProd_32f - 35% faster.

* Eliminate unnecessary v_reduce_sum instructions.

* Improve support for Windows Embedded Compact

* Remove redundant set(WINCE true) and format CMake

* Added support for the ONNX "ReduceMean" Layer. (as this is the same as the GlobalAveragePool)

* Add ReduceMean test

* Fix ONNX importer

* Fix ReduceMean

* Add assert

* Split test

* Fix split test

  * use SOLVE_EPNP for the initial guess

WUI based implementation to initUndistortRectifyMap (#14994)

* Add initUndistortRectifyMap performance test

* Move cv namespace boundaries

* Add wide universal intrinsics based implementation to initUndistortRectifyMap

* Dispatch undistort

* Fix dumpToFile

* Add test

* Fix test

* Reduce store gathering pressures - speeds thresholds by up to 20%

* Rename temporary histogram array and initialize so that MACOSX builder is happy