[poppler] Annot rendering improvements

[Fabio D'Urso]

>> 0002 fixes the existing AnnotGemetry::draw method.
> Can we get a pdf that shows the problem?
The problem only shows up after setting the interior color, because AnnotGeometry::draw
method wrongly assumes that AnnotColor always represents some color. It's not always
the case because "new AnnotColor()" is transparent color.
I attached a diff that can be used to trigger this behavior and the resulting rendering

> All the rest seem to be new feature, let's wait for the outcome of the Beta 3 
> mail. But please prepare some pdf showing the need of those changes.
I'm attaching a pdf that shows all the changes and some screenshots I took
 		 	   		  
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