* Remove fp_lib token from board and s-expr netlist file format.
* Fix a bunch of Doxygen warnings.
* Remove some extra debug log messages.

Pcbnew: Redesign layer selection and layer pair selection (give them a look near the Layer selector in toolbarr)

Add pl_editor_doc.icns, from Orson. Fix Bug #1217504  (bad look of Module Properties Dialog, 3D fields).
Add Dick's workaround in plot_board_layers.cpp to try to avoid crash in solder mask calculations, due to a bug in boost::polygon, in resize function.

Others: fix very minor issues.

Pl_Editor: fix copyright in files. Enhancement when creating new items.

*) add hotkey for setting the grid origin as 'S', in board editor, module editor.
*) re-position the function interface for cursor movement from BASE_SCREEN into
   class EDA_DRAW_FRAME.  This is a prelude to getting rid of BASE_SCREEN or
   splitting it up.