BUG: fixes for 3808 fiducial picking issue

See http://na-mic.org/Bug/view.php?id=3808

Note that fixing this requires the corresponding fixes
to VTKv6 and LandmarkRegistration

https://github.com/pieper/LandmarkRegistration/commit/d9393f515b4798d9904fdd0383d959b91fc1edfb

https://github.com/pieper/VTK/commit/f3d6cc2503375724e60dd73d9a93ba9c764be26e

COMP: fix repository url and error macro usage

From: Steve Pieper <pieper@bwh.harvard.edu>

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23648 3bd1e089-480b-0410-8dfb-8563597acbee