Part of SuBSENSE algorithm is based on ViBe method, that is patented in
Europe ans U.S.
This means that SuBSENSE can not currently be released under the BSD
license. We are trying to resolve the issue.
In waiting, I am forced to remove the algorithm from the "official"
branch on which the pull-request on opencv_contrib will be made . The
code has been moved to an opportune branch (that will not be merged) and
will remain there waiting for this issue to be clarified.

Merge branch 'saliencyModuleDevelop' of https://github.com/fpuja/opencv_contrib into saliencyModuleDevelop

Short description ad UML class diagram of the module

Change Rect to Rect2d in Tracker::update() and ::init()

I've changed Rect to Rect2d in Tracker::update(), Tracker::init() and
all related methods (including documentation). This allows to initialize
trackers with double-valued rectangles, thus adding versality. Besides,
trackers also can output double-valued rectangles, which may be
beneficial in some scenarios.

However, it remains to change UML diagrams in documentation to tracker
module, as they still display methods above with old signatures.