2D to 3D coordinates convertor

This includes the formulae coded to return:
1) The distance of the object from the line joining the cameras.
2) The distance of the object from the horizontal line perpendicular to
the line joining cameras.
3) The height of the object from the horizontal plane (currently this
formula is very wrong).

The parameters used are:
1) Horizontal field of view of the camera.
2) Vertical field of view of the camera.
3) Distance between the cameras.