Revision 1809

(ProjFrame.build_dialog): Instantiate
all projection type specific panels and put them into a
NotebookLikeSizer. This way the dialog doesn't change its size
when a different projection is selected
(ProjFrame.__init__): Rename projection_panels
projection_panel_defs and reuse projection_panels for a list of
the instantiated panels.
(ProjFrame._show_proj_panel, ProjFrame.__DoOnProjAvail)
(ProjFrame.__DoOnProjChoice): Changes due to the new handling of
the panels
(UnknownProjPanel._DoLayout): Place the newlines in the message
differently to make the panel narrower.
(TMPanel._DoLayout): Layout the parameters in one column.