fixed possibly inccorrect interval measurements in flann's timer (bug #1165). Note: this may break binary compatibility, but since the class is not wrapped in Java and not exposed in Windows API, for example (it's considered internal-use class for flann), the effect should be minimal

added recommended number of stripes to parallel_for_, modified some of the functions to use larger stripes (for better performance)

Replaced SVN instructions with Git ones for 'Installation in Windows' section (Issue #2249); Also, fixed both bugs from issue #2374 in the same section.

Replaced SVN instructions with Git instructions in iOS and Linux installation tutorials. Issue #2249
+ Minor formatting fixes.

Ticket #2426

Data rase in OpenCV Manager connection fixed.

change the download channels to oclchannles()
fix bugs of arithm functions
perf fix of bilateral
bug fix of split test case
add build_warps functions