Add IPP support in cvtColor function
macros -> template in IPP support cvtColor
gpu TVL1 Optical Flow optimization:

do not calculate sum of error in every round of iteration;
instead the error will be summed every 2nd times or more, 
if the previous sum of error is too far away from threshold.
Merge pull request #1346 from jet47:gpu-tvl1-optimization
Restored one executable bit that was lost during the war on whitespace.
appended ocl::finish to test_cycle defines
Merge pull request #1349 from ilya-lavrenov:ocl_perf_finish
Deleted the now-empty ocl perf_precomp.cpp.

See pull request #1241 for why.
Merge pull request #1213 from kdrobnyh:color
Merge pull request #1357 from SpecLad:less-precomps
Bug #3238 Android sample image manipulations blinks in non-preview modes fixed.
New Tegra detector with Android 4.3 support added. Manager version++.
LibTIFF Win32 API back-end disabled for Windows RT.
Merge pull request #1343 from asmorkalov:android_img_manipulations_fix
Merge pull request #1338 from asmorkalov:android_tegra_detector
/apicontainer added to linker flags on WinRT to fix api test issues.
Merge pull request #1359 from asmorkalov:winrt_tiff_api_fix
Merge pull request #1361 from asmorkalov:winrt_api_container