removed ERFilter (to be moved to opencv_contrib/modules/text) and lineMOD (to be moved to opencv_contrib/modules/rgbd)

Updated documentation and sample to use the new function API

ReST directive was used. Also fixed some other ReST directives that were
not correct and removed some warnings during buildbot checks.

Add a new variant of detectMultiScale with output arguments 'objects' and 'numDetections'; factor most of detectMultiScale's code into 2 protected methods

It was merged by mistake.

This reverts commit ab6be9b7.

receives the number of neighbors joined into each detected object

Documentation: fixed class/struc members documentation; added warning on incorrectly documented member