fixed some bugs in gpu module under Windows:
* convertTo alignment error
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* convertTo alignment error
* compare with scalars error

fixed several problems with CUDA 5.0
* gpu::LUT, uses device memory instead of host memory
* gpu::multiply, round mod for CV_8U depth
........

* gpu::LUT, uses device memory instead of host memory
* gpu::multiply, round mod for CV_8U depth

moved TargerArchs and DeviceInfo to core
fixed bug in GpuMat::copy with mask (incorrect index in function tab)

used random images in gpu filter tests

added assertion on double types for old devices

changed epsilon for matrix comparison in gpu::sqrt test

added additional tests for gpu filters
fixed gpu features2D tests

fixed some bugs in gpu module

refactored tests for them

wrote more complicated tests for them
implemented own version of warpAffine and warpPerspective for different border interpolation types
refactored some gpu tests

removed void integral(const GpuMat& src, GpuMat& sum, GpuMat& sqsum, Stream& stream) - it fails with NPP_NOT_IMPLEMENTED error
updated docs, accuracy and performance tests

update gpu tests