* js: update build script

- support emscipten 1.38.12 (wasm is ON by default)
- verbose build messages

* js: use builtin Math functions

* js: disable tracing code completelly

- always pass DEPTH_dst value to core/arithm kernel

Commits:
- 09837928
- 10fb88d0

Excluded changes with std::atomic (C++98 requirement)

* fix some static analyzer warnings

* fix some static analyzer warnings

* fix race condition of workthread control

To avoid duplicates in binaries

  * replace the implementation by universal intrinsic
  * make sure no degradation happens on ARM platform

Updated integrations for:
cv::split
cv::merge
cv::insertChannel
cv::extractChannel
cv::Mat::convertTo - now with scaled conversions support
cv::LUT - disabled due to performance issues
Mat::copyTo
Mat::setTo
cv::flip
cv::copyMakeBorder - currently disabled
cv::polarToCart
cv::pow - ipp pow function was removed due to performance issues
cv::hal::magnitude32f/64f - disabled for <= SSE42, poor performance
cv::countNonZero
cv::minMaxIdx
cv::norm
cv::canny - new integration. Disabled for threaded;
cv::cornerHarris
cv::boxFilter
cv::bilateralFilter
cv::integral

Exp and Log IPP implementations are changed to hal interface;

1) fix multichannel support
2) remove useless bad_value, read value from original Mat directly
3) add more tests
4) fix docs for cvCeil and checkRange

The original solution did not handle correctly when delta = 0,
resulting as nan errors. I also wrote a test case to test solving
equation x^3 = 0 after fixing.

some functions were not found in namespace std

calculates cube root of complex number to give more correct results.

solves equations more correctly, eliminates “nan” error.

hack solvePoly to finds roots of polynoms with zero higher-order coefficients. The roots are populated in this case, which is not valid, strictly speaking, but good enough for function like correctMatches. This solves http://code.opencv.org/issues/4330

fixed http://code.opencv.org/issues/3935
possibly fixed http://code.opencv.org/issues/3594