New version of Gtktree widget

[BOLLIET Jerome <bolliet in2p3 fr>]

Hi,

This is a new version a my gtktree widget. This patch is for
gtk+-971201 release of gtk.

What's new : 
- pixmaps use good colors (thanks stefan :)
- add of two buttons in testtree for add and remove items.

Known bug (but it's too late for correct it) :
- remove an item and some items of his subtree make generally a core.

Good night.

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gtktree-971202-patch.gz