Fixed suggestion of bugfix 3431
Seems correct to me and builds fine
All CUDA related stuff were moved to separate dynamic library.
Dynamic CUDA support library loading implemented for Linux.

Logical mistake in macro fixed;
DeviceInfo deligate reimplemented;
Build and warning fixes.
modify signature of stereoCalibrate for consistency
Build fix.
update doc accordingly
Add set/get depth generator properties by default. Add documentation
Merge pull request #1987 from pentschev:cv_completesymm_template_2.4
optimize Dx and Dy calcualtion to make it as single opencl kernel
HOST side optimization for GFFT
remove extra calculations from haar to be consistent with native implementation
Changes the datatype of the angle of the gradient for Intel platforms.
optimize separable filter by
Added "sep_filter_singlepass" kernel that performs separable filtering in one kernel call
Added appropriate host part - sepFilter2D_SinglePass function and SingleStepSeparableFilterEngine_GPU class
Changed function declarations to enable their usage
optimize SURF by
Inlining and customizing sampling functions to reduce memory traffic and compute
Improve calcOrientation implementation.
Using more efficient rounding routines.
Removing unnecessary use of local memory
Fix notes about cmake files. Fix build warning.
GFFT fix for linux build
typo
update doc to be consisted with headers
Fix build errors
minor refactoring, no functional changes