// JLH 09/19/2006 Created this file
// JLH 03/22/2011 Moved implementation of constructor from header to here
// JLH 04/02/2011 Fixed divide-by-zero bug in Unit(), added Angle() function
// JLH 09/19/2006 Created this file
// JLH 03/22/2011 Moved implementation of constructor from header to here
// JLH 04/02/2011 Fixed divide-by-zero bug in Unit(), added Angle() function