* Supported yolov4-tiny

* Added comments

Clarify component statistics documentation

* Change ConnectedComponentsTypes documentation

Change from "algorithm output formats" to "statistics" because it specifies types of statistics, not formats.

* Documentation: clarify component statistics

Explain that ConnectedComponentTypes selects a statistic.

* Clean: make the use of the indices array length consistent

Either we don't want this method to be used in the future for any other node
than the root node, and so we replace indices_length by size_ and remove it as
argument, or we want to be able to use it potentially for other nodes, and
so using size_ instead of indices_length would have lead to a bug.

* Fix: b was not an address

* Fix: transpose the Flann repo commit "Fixes in accum_dist methods" from Adil Ibragimov

Avoids trying to compute log(ratio) with ratio = 0

* Fix: transpose the Flann repo commit "result_set bugfix" from Jack Rae

* Fix Jack Rae commit as the initial i - 1 index was decremented before entering the loop body

* Clean: transpose the Flann repo commit "Updated comments in lsh_index" from Richard McPherson

* Fix: Transpose the Flann repo commit "Fixing unreachable code in lsh_table.h" from hypevr

* Fix warning the same way it was done in flann standalone repo

* Change the return value in case of unsupported type

Added/Fixed testcases for SIFT

* merge perf_sift into conventional perf tests

* Fix disabled SIFT scale invariance tests

allows trainIdx duplication in matching scaled keypoints

backported commit 86905754

https://github.com/libjpeg-turbo/libjpeg-turbo/releases/tag/2.0.5

http://www.ijg.org/files/jpegsrc.v9d.tar.gz

Instead of using the current dimension for which we just got a big span,
we were computing Min and Max for the previous dimension stored in cutfeat
(and using 0 instead of the dimension indice for the very first dimension
with "span > (1-eps)max_span")

origibal commit: 63e92ccc

  * use only supported CC in the list
  * workaround of #17526