distribution things

  distribution things
  implemented native docking for menus and toolbars
    (see toolbar sample) someone may have to create
    the new wxMenuBar constructor
  corrected wxFileDlg appearance and made it i18n
  implemented defaults buttons
  improved look of all common dlgs except print setup
  corrected forty's player dlg
  added wxMB_DOCKABLE and wxTB_DOCKABLE flags
  augmented BETA_VERSION to 4
  prevent wxListBox from sending a list_item_selected
    event when adding the first item to a list that
    is a single selection list using AppendXX()

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@1673 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775