Modified sparse pyrlk optical flow to allow input of an image pyramid which thus allows caching of image pyramids on successive calls.
Added unsigned char support for 1, 3, 4 channel images.

* use opaque algorithm interfaces
* add stream support

This reverts commit fba72cb6, reversing
changes made to 02131ffb.

Made all STL usages explicit to be able automatically find all usages of
particular class or function.

- 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

not it support all depths

This reverts commit 7e301c5c, reversing
changes made to b5e009eb.

vector index out of range

new implementation of gpu::PyrLKOpticalFlow::sparse (1.5 - 2x faster)
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new implementation of gpu::PyrLKOpticalFlow::dense (1.5 - 2x faster)
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