allows trading corner precision for corner quantity

also add shortcut if markers are aligned with image axes

[Aruco] Fixed the spelling of Length in Samples

replaced images to 6x6_250

Updated README

[Aruco] Updated Charuco Diamond Detection Tutorial Readme

[Aruco] Updated Charuco Board  Detection Tutorial Readme

[Aruco] Updated Aruco Tutorials  Readme

[Aruco] Updated Aruco Tutorials  Readme

Added a new line at the end of file.

Update aruco_board_detection.markdown

Update aruco_calibration.markdown

Update aruco_detection.markdown

Update charuco_detection.markdown

Update charuco_diamond_detection.markdown

Update README.md

Update charuco_detection.markdown

`lenght` --> `length`

type should be OutputArray instead of OutputArrayOfArrays.
at<Vec3d> is one dimensional. (fixes debug assert)
fixes #574

results in less code and more consistent parameter handling.

allows using Mat and vector<Vec3d> as argument for rvecs, tvecs that are
allocated at once.

also avoids manual memcpy: the predefined dictionary data is not
duplicated any more.

store marker internally as
"r0_b0, r0_b1, .. , r0_bn, r2_b0, .." instead of
"r0_b0, r1_b0, .. , rn_b0, r1_b0, .."
i.e. the same as in predefined_dictionaries.cpp.
This makes loading a dictionary a simple memcpy and also allows to get
rid of the custom hammingDistance implementation in favor of
hal::normHamming.