j3dcore: check in a snapshot of the GeometricTools segment to segment distance function

- adapted from code under the Boost 1.0 license, here distributed as GPLv2 + classpath

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
j3dcore: convert GeometricTools Segment-segment distance code to Java3d/vecmath types

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
j3dcore: check in a snapshot of the GeometricTools ray to segment distance function

- adapted from code under the Boost 1.0 license, here distributed as GPLv2 + classpath

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
j3dcore: convert GeometricTools Ray-segment distance code to Java3d/vecmath types

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
j3dcore: use the new Utils helpers to remove the last dependency on the Distance class

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>