text system patch

[Pierre-Yves Rivaille]

I've made some fix on the various text system classes and I would like to 
receive comments on what I have done before I commit those fixes on CVS. 
(I'd like to commit soon, 'cause i've made changes in Gorm that depends on 
it)

What is now fixed :
-insertion point position is correct for left/center/right alignment
-selection display is also correct for all alignment
-insertion point blinking is better
-textContainerInset is well managed
-autoscrolling works a little bit better (but still needs work)
-textfield editing is properly aligned
-textfield can be scrolled

<text-system.patch.gz>
(the code still needs some cleaning and commenting)

        Pierre-Yves

text-system.patch.gz
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