Pcbnew s-experssion footprint library implementation.

* Add footprint methods to PCB_IO.
* Add FP_CACHE and FP_CACHE_ITEM for handling new footprint library design.
* Add code to save legacy libraries in new format.
* Change behavior of BOARD_ITEM::GetLayerName() to return the default layer
  name when the item does not have a BOARD as a parent.
* Minor changes to the module output formatter when writing to module library
  files (no BOARD as parent).
* Add new (and some that I forgot along the way) CMake flags to
  EDA_BASE_FRAME::CopyVersionInfoToClipboard().
* Add -Wno-narrowing to GCC flags to stop GCC 4.7 from complaining about
  a conversion from int to unsigned in the Boost polygon library.
* Add INPUT_STREAM_READER to richio.cpp to allow using any object derived
  from wxInputStream as a LINE_READER (needs to be validated).

common/basicframe.cpp

@@ -499,6 +499,27 @@ void EDA_BASE_FRAME::CopyVersionInfoToClipboard( wxCommandEvent&  event )
 
     tmp << wxT( "Options: " );
 
+    tmp << wxT( "         USE_PCBNEW_SEXPR_FILE_FORMAT=" );
+#ifdef USE_PCBNEW_SEXPR_FILE_FORMAT
+    tmp << wxT( "ON\n" );
+#else
+    tmp << wxT( "OFF\n" );
+#endif
+
+    tmp << wxT( "         USE_PCBNEW_NANOMETRES=" );
+#ifdef USE_PCBNEW_NANOMETRES
+    tmp << wxT( "ON\n" );
+#else
+    tmp << wxT( "OFF\n" );
+#endif
+
+    tmp << wxT( "         USE_PCBNEW_SEXPR_FOOTPRINT_LIBS=" );
+#ifdef USE_PCBNEW_SEXPR_FOOTPRINT_LIBS
+    tmp << wxT( "ON\n" );
+#else
+    tmp << wxT( "OFF\n" );
+#endif
+
     tmp << wxT( "         KICAD_GOST=" );
 #ifdef KICAD_GOST
     tmp << wxT( "ON\n" );