Specify the HOME viewing orientation of the X-window. This is the viewing orientation
when the X-window is first opened, and is also the viewing orientation the X-winndow
returns to whenever the HOME key is pressed.

<p>
The default HOME orientation is such that the <i>x</i> axis points from left to right, 
and the <i>y</i> axis points points from bottom to top, and the <i>z</i> axis points 
out of the screen.  But this can be changed by setting <tt>rotateangle</tt> and then
call <tt>rotate</tt> and <tt>saverot</tt>.

<p>
<tt>rotateangle = [ <i>h_rot v_rot s_rot scale</i> ] </tt>
<br>
where <tt><i>h_rot</i></tt> is the rotation angle (in degrees) from left to right (i.e.
equivalent to dragging the mouse in the horizontal direction), 
<tt><i>v_rot</i></tt> is the rotation angle (in degrees) from bottom to up (i.e.
equivalent to dragging the mouse in the vertical direction), 
<tt><i>s_rot</i></tt> is the rotation angle (in degrees) in the clockwise direction (i.e.
equivalent to pressing the Page-Down key in the X-window),
<tt><i>scale</i></tt> is scales the size of all objects plotted in the X-window.

<p>
Also see <tt>openwin</tt>, <tt>plot</tt>.
