Up to date with new files

Smoother, more grammatical description.

On analysis

erGrouping python bindings and sample script textdetection.py which mimics the same detection pipeline as in textdetection.cpp

For some unknown reason xobjdetect.hpp is included twice.

	modified:   modules/line_descriptor/perf/perf_matching.cpp
	modified:   modules/line_descriptor/test/test_matcher_regression.cpp

	modified:   modules/line_descriptor/perf/perf_matching.cpp
	modified:   modules/line_descriptor/test/test_matcher_regression.cpp

- read image as 1-channel grayscale
- 3 trackers to control function parameters
- K allowed to go to negative values (usually to detect black text on white bg)

- no for-loops
- support all thresholding types
- support any input image depth
- add Doxygen comments

otherwise we get a failed assertion from OutputArray::create