[vtkusers] vtkPLYReader patch to allow points only

[David Doria]

Current vtkPLYReader does not allow reading files that do not contain faces
(i.e. files with only points or points+normals). It simply quits with an
error "Cannot read geometry". I modified this class to allow this type of
file to be read, along with making the error output a bit more specific in
the case that there actually is a problem. In the process I think the whole
section that searches for properties became a bit clearer - as previously it
was all embedded in a single if statement.

Here is the new along with a patch and a couple of test ply files:
http://www.rpi.edu/~doriad/VTK_List/vtkPLYReader_Patch/

Thanks,

David
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