axes limit calculations

[David Bateman]

While adding the graphics group objects like bar series, I noticed an 
issue with the way the axis limits are updated. The problem is that with 
each new object added or updated the limits are set, even if they aren't 
changed.

In general this would not cause a problem, but due to the fact that I 
associate a callback function to the "xlim" property of the axis to 
update the baseline of the bar and stem series, this callback is called 
many many more times that it needs to be. As the callback can be 
expensive this is an issue.

I see two manners in which to treat this issue

* If the [xyzac]limmode is "auto" and the value of the limit remains the 
same, don't set the value and therefore don't execute the callbacks. Of 
course if the [xyzac]limmode is "manual" and the limit is set even if 
its the same value then the callback should be called as this means the 
user explicitly set the limit

* If the [xyzac]limmode is "auto" then defer the setting of the limit 
itself till the [xyzac]lim_get method is called.

Michael/Shai could we make a change like this? If so it would make the 
bar and stem series objects significantly faster.

Regards
David

-- 
David Bateman                                David.Bateman at motorola.com
Motorola Labs - Paris                        +33 1 69 35 48 04 (Ph) 
Parc Les Algorithmes, Commune de St Aubin    +33 6 72 01 06 33 (Mob) 
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