fill destination matrix with zeros if it was reallocated

Logical mistake in macro fixed;
DeviceInfo deligate reimplemented;
Build and warning fixes.

GpuMat::setTo function, removed NPP call for CV_8S

Also, I made a separate macro for the current function name, which
helps simplify a lot of code that uses it.

- new reduce implementation (with kepler optimizations)
- saturate_cast via asm command
- video SIMD instructions in element operations
- float arithmetics instead of double
- new deviceSupports function

- fixed printCudaDeviceInfo for new CC
- fixed some compilation errors and warnings
- removed unset command from CMake script
- removed unused std imports

fixed some bugs in gpu module under Windows:
* convertTo alignment error
........

* convertTo alignment error
* compare with scalars error

added getParams method to VideoWriter_GPU

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

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