stem series objects

[David Bateman]

Now that Michael and Shai have added listeners, hggroups and the ability 
to add properties dynamically to objects we should use these abilities 
to make stem, bar, contour series objects and use the callback 
capability of the listeners to fix the plotyy function, and I think this 
should be done before 3.2 is released. With that in mind find attached a 
changeset that adds the stem series objects that I used as a test case 
to try and see how all this stuffed worked. So Michael/Shai, please have 
a look at this and see if there is anything I missed in the 
implementation of this function.

The patch also addresses three issues in the current graphics code that 
I noticed.

* In __go_draw_axes__.m respect the "visible" property of graphics 
objects and don't draw objects that aren't visible
* Fix an off by one error in gh_manager::do_execute_callback
* In the graphics base property class add a caseless comparison functor 
and use it in the property map to ensure that the get/set functions find 
properties in a case insensitive manner.

Regards
David
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