SoftFloat: added sin, cos and docs (#9329)

* softfloat: comparison operators made inline, min() max() eps() isSubnormal() added

* softfloat: get/set sign/exp

* softfloat: get/set frac

* softfloat: tests rewritten with new tools

* softfloat: added pi(), sin(), cos()

* softfloat: more comments

* softfloat: updated sincos arg reduction

* softfloat: initial tests for sincos added

* softfloat: test works, code cleanup is pending

* softfloat: sincos argreduce rewritten

* softfloat: sincos refactored and simplified

* softfloat sincos: epsilons calibrated

* softfloat: junk code removed from tests

* softfloat: docs added

* inline comparisons undone; warning fixed

NORM_RELATIVE | NORM_INF, NORM_RELATIVE | NORM_L1 and NORM_RELATIVE | NORM_L2
respectively in the documentation for cv::norm and cv::NormTypes

An example program shows using cv::findHomography and cv::warpPerspective for image warping

* Remove "simple" flow estimation from help (because it was disabled by 653bca8b)
* Add `flush` after printing iteration number for better UX

OpenCV 3.3.0

OpenCV 3.3.0

OpenCV 3.3.0 for Intel Computer Vision SDK