quiet the newer g++ compilers, which complain about certain stdio function's return values not being used

See also changelog

See also changelog

* Use single list for component library draw item and fields to simplify
  component library object.
* Add field manipulation helper methods to component library object.
* Make component library draw item edit dialog sizable.

* Created new component library editor draw item dialog box with
  wxFormBuilder.
* Removed previous DialogBlocks version of the draw item dialog box.
* Removed some additional global variables used in component library
  editor.
* Add IsFillable() method to draw item base object.

LibEdit: fixed a bug (bad format in a Printf) that crashes libedit when testing a component with duplicate pins.
Also cleaned and enhanced WinEDA_LibeditFrame::OnCheckComponent() code

* Remove global variables used by the library editor.
* Add SetWidth() method to library draw objects.

* Replace all known instances of (const wxChar*) casts to GetChars() for
  wxWidgets 2.9 compatibility.
* Cleaned up get component dialog so last part gets saved on wild card
  selections.
* Remove redundant schematic component drawing code.
* Added SCH_COMPONENT constructor to create new component from library
  component object.
* Add message panel helpers to WinEDA_DrawFrame and update old message
  panel access code.
* Using library viewer to add component to schematic now respects unit
  and body style selection.

Big cleanup of sourcetree root structure, added Documentation subfolder, moved packaging stuff for osx and windows (nsis) to packaging.

* Create single event handler for grid size events.
* Fix all frame windows to use new grid size event handler.
* Use offset relative to ID instead of ComboBox index to save last grid size.
* Move last grid size load/save setting into WinEDA_DrawFrame.
* Add equality and assignment operators the GRID_TYPE.
* Add current grid helper methods to BASE_SCREEN.
* Add GetPins helper to LIB_COMPONENT to replace GetNextPin where applicable.
* Add AppendMsgPanel helper to WinEDA_DrawFrame.
* Improve rounding for display of coordinates when millimeter units are selected.

fixed a minor problem in pcbnew compiled in DEBUG mode, that prints a lot of error messages when loading a board