-Added parameter "Mem/ReduceGraph" with new link type (NeighborMerged)
-DatabaseViewer: add Info panel, fixed empty extracted database when "RGB images" is not checked
-ConsoleWidget: added buffer size and refresh rate options
-DBDriver: new database info getters
-Graph: added reduceGraph() method, added Dijsktra computePath() with links only
-Updated default parameters: RGBD/LocalLoopDetectionSpace=true, RGBD/LinearUpdate=0.1 and RGBD/AngularUpdate=0.1
-Goals are saved with label instead of ID if the target node has a label
-DataRecorder: fixed saving incrementally the database (instead of only at the end)
-MainWindow: When waypoints are used, resend the current goal (1 sec delay) if it has failed setting it
Libraries are installed in lib directly with symbolic links, not in lib/rtabmap-0.8. Removed the need of RPATH in cmake.
Saving variance of each link in database (new field Link.variance). The variance is used to generate the constraint information matrices for TORO optimization.
ICP: computing variance instead of fitness.
ICP3: added correspondences ratio parameter
Added OdometryInfo class
Refactoring: renamed depth2d stuff to laserScan. rtabmap::Memory and rtabmap::Signature classes (no more distinct neighbor, loop closure or child loop closure links, only links with different types)
