Fl_Tree related mods

    * open() / close() now can invoke the callback().
      New method callback_reason() lets one determine the cause.
      (Used FLU's tree for reference on this)

    * new Fl_Tree methods:
      > item_pathname()
      > show_item(), show_top(), show_middle(), show_bottom().
      > next_selected_item() -- loop through the selected items.
      > callback_item() -- the item that caused the callback
      > callback_reason() -- reason the callback was invoked
             FL_TREE_REASON_SELECTED    -- item was selected
             FL_TREE_REASON_DESELECTED  -- item was de-selected
             FL_TREE_REASON_OPENED      -- item was opened
             FL_TREE_REASON_CLOSED      -- item was closed
      > position()
      > display()

    * new Fl_Tree_Item methods:
      > find_child_item() -- searches children for a path
      > find_item()       -- searches self and children for a path
      > next(item)        -- loop forward through tree
      > prev(item)        -- loop backward through tree
      > first_selected_item()
      > next_selected_item()
      > x(), y(), w(), h()

    * deprecated:
      > item_clicked().  Use callback_item() instead

    * the 'docallback' optional integer argument for all methods
      is now back to 0 or 1 only. (Other values became unnecessary
      when above new callback() behavior was defined)

    * test/tree has new "Test Callback Flags" button to test the
      'docallback' flags for eg. open/close/select/deselect
      to make sure no bugs creep in.

    * INTERNAL: added free_path() to free special path array created by parse_path().

    * Various docs strengthened:
	* How to use first()/next() and last()/prev() to walk tree
    	> made sure more method's options use \param[in]
	> Added more \see references

    * Moved several implementations from .H -> .cxx
    * Added autoscroll to keyboard nav and mouse drags
    * test/unittests: added Fl_Tree to scrollsize test

        TODO:
	    o Horiz scroll bar (see Johannes Schock's email re. additions he sent)
	    o Need to allow keyboard nav to move focus to child FLTK widgets
	    o Fix fast-selections so that no gaps are left behind.
	      (Select all items from the last selected item to the current)
	    o Investigate non-default values of when() causing odd behavior.
	      (See the tree demo's when() pulldown..)

    * tree demo modified to include top/mid/bot buttons that test the above.

    * Keyboard navigation added:
		Up/Down       -- move focus
		Left/Right    -- closes/opens tree item in focus
		Spacebar      -- toggle selection state of item in focus
		Enter         -- selects the item in focus, deselecting all others
		Tab/Shift-Tab -- change widget focus

    * All Fl_Tree select() and deselect() methods now return a value
      that indicates if the item's state was changed.

    * Fixed focus box drawing (focus box resides more precisely within item's box)



git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@7691 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

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