This fixes random failures in Java wrappers.

Sometimes information about dependencies causing disabling were loosed and it
was not possible to correctly display these dependencies in status report

Invalid links and refences fixed.
SpaeseMat class documentation updated.

Changed RANSAC Homography estimation for speed. Each minimal set is checked for consistency before actually fit a candidate homography.

This suppresses "unused variable" CMake warning when user explicilty disables
module unavailable in selected configuration

issue 2526

issue #2678