Various mods for Fl_Tree

    o Fix STR#2828 (E): {Vertical|Widget} Gap
    o Moved Fabien's reselected methods to Fl_Tree_Prefs,
      return method made const, doxygen, removed underbars from methods
      (to follow general API)
    o Widgets can now appear to the right of labels.
      This can be controlled with item_draw_mode(FL_TREE_ITEM_DRAW_LABEL_AND_WIDGET)
    o Cleaned up Fl_Tree_Item::draw(), Fl_Tree::draw()
    o New methods:
            marginbottom()       -- [ABI feature] extra space below last tree element when scrolling
            widgetmarginleft()   -- [ABI feature] space to left of widget
            usericonmarginleft() -- space to left of usericon
            labelmarginleft()    -- space to left of label
            item_draw_mode()     -- control how items, widget() are drawn
    o Updated Fl_Tree docs, tree-elements.png
    o test/tree: added sliders to test the above new features,
      added "open all" and "close all" buttons
    o Probably other stuff..


TODO: Fix "scroll-beyond-bottom" (STR#2796)
TODO: Fix other items in STR#2828



git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@9377 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

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