some optimizaions of cv::pow
optimized cv::calcHist
eliminated convertTo
optimized histogram merging
cv::equalizeHist
optimized cv::boxFilter
Add peromance tests for OCL integral sum of square
Change threshold
Fix error
Increase epsilon for pass sanity check
Merge pull request #2840 from ilya-lavrenov:tapi_calchist
Merge pull request #2847 from ilya-lavrenov:tapi_pow
Merge pull request #2864 from ilya-lavrenov:tapi_boxfilter
Merge pull request #2878 from vbystricky:ocl_integral_sqsum_perf_test
Change kernel for optimization. Remove restriction to align data
Fix kernel compilation errors on AMD system
Fix licanse information in cl file
Support CV_64F destination type
Change build options of the kernel
Optimize sum of square