PROJECT - project to edge in triangulated model

projectToEdge - Project point with specified (x,y) coordinates to specified
                edge
Function Prototype:
void projectToEdge (Edge *e, float *x, float *y)

Input:
e		edge to which point is to be projected
x		x-coordinate before projection
y		y-coordinate before projection

Output:
x		x-coordinate after projection
y		y-coordinate after projection

Author:  Dave Hale, Colorado School of Mines, 09/11/90