* Support Slice layer in ONNX importer

* Add IE support

* Fix ONNX importer

* Fix Slice

* java: fix java SimpleBlobDetector

* add SIMPLEBLOBFeatureDetectorTest

* add package org.opencv.test.features2d;

* fix SIMPLEBLOBFeatureDetectorTest

* cast positional arguments to int

* Changed to integer division based

* removed white space

* removed white space

backporting of commit: 76fca0e7

* Add Axpy layer

* Fix test

* fix caffe importer

Fix build issue on QNX platform (#14678)

* QNX compatibility

* core: unify gettimeofday() usage

* Revert the bad parts of b085158d to fix https://github.com/opencv/opencv/issues/11131
but preserve the good parts to keep https://github.com/opencv/opencv/issues/10791 fixed

* calib3d: add regression test for stereoCalibrate to fix https://github.com/opencv/opencv/issues/11131

because t = (time.time() - t) will return seconds,  dividing by 1000 to obtain seconds will be incorrect.

https://github.com/protocolbuffers/protobuf/compare/v3.5.1..v3.5.2