refactored Morphology Filters
refactored Image Rank Filters
refactored 1D Sum Filters
refactored StereoBM
refactored StereoBeliefPropagation
refactored StereoConstantSpaceBP
refactored DisparityBilateralFilter
switched to Input/Output Array in  reprojectImageTo3D & drawColorDisp
support elementwise division for Matx with "/" operator.
fix for #3077
removing "-fvisibility=hidden" gcc option due to lack of `__attribute__ ((visibility("default")))` in jni_md.h/JNIEXPORT
updated documentation
Starting implement simplex algorithm.
fixed Kirill's comments
updated licenses
updated documentation
Updated testlog_parser.py to the latest version from the private repo.
Added a new and improved version of the XLS report generator.
In the XLS report, enabled word wrapping for header cells.

Otherwise, Excel ignores line breaks in them.
Made the order of tests in XLS reports deterministic.
Made xls-report.py ignore tests that were not successful.