Add rbox option 'Cn,r,m'. It may trigger wide facets due to nearly coincident points. If this occurs, Qhull 2015.1 will report an error. For Delaunay triangulations a workaround is to add a bounding box to the input set.

html/qh-impre.htm

Add a section about precision errors for 'Nearly coincident points on an edge'

html/index.htm#geomview

Add instructions for building Geomview on Windows.
Add instructions for using Geomview to view Qhull examples.