Pcbnew s-expression file parser bug fixes and file size improvements.

* Use index when saving layers to handle translated layer names.
* Add LOCALE_IO switcher when loading s-expression format.
* Make SEGVIA default to through hole to improve file size.
* Don't save default orientation of 0 degrees in TEXTE_MODULE and TEXTE_PCB.
* Don't save default zone configuration parameters.
* Save multiple zone corners on a single line.
* Fixed missing ( check in graphic and module arc parsers.
* Consistency improvements for DRAWSEGMENT and EDGE_MODULE objects.
* Minor tweaks to D_PAD formatting.

common/pcb.keywords

@@ -129,8 +129,8 @@ priority
 pts
 radius
 rev
+rect
 rect_delta
-rectangle
 reference
 right
 rotate
@@ -165,7 +165,6 @@ trapezoid
 thru
 thru_hole
 tstamp
-use_thermal
 user
 user_trace_width
 user_via

pcbnew/class_board.cpp

@@ -74,10 +74,14 @@ BOARD::BOARD() :
 
     BuildListOfNets();                      // prepare pad and netlist containers.
 
-    for( int layer = 0; layer < NB_COPPER_LAYERS; ++layer )
+    for( int layer = 0; layer < LAYER_COUNT; ++layer )
     {
         m_Layer[layer].m_Name = GetDefaultLayerName( layer );
+
+        if( layer <= LAST_COPPER_LAYER )
             m_Layer[layer].m_Type = LT_SIGNAL;
+        else
+            m_Layer[layer].m_Type = LT_UNDEFINED;
     }
 
     m_NetClasses.GetDefault()->SetDescription( _( "This is the default net class." ) );
@@ -356,8 +360,8 @@ wxString BOARD::GetLayerName( int aLayerIndex ) const
     if( !IsValidLayerIndex( aLayerIndex ) )
         return wxEmptyString;
 
-    // copper layer names are stored in the BOARD.
-    if( IsValidCopperLayerIndex( aLayerIndex ) && IsLayerEnabled( aLayerIndex ) )
+    // All layer names are stored in the BOARD.
+    if( IsLayerEnabled( aLayerIndex ) )
     {
         // default names were set in BOARD::BOARD() but they may be
         // over-ridden by BOARD::SetLayerName()

pcbnew/class_board.h

@@ -199,7 +199,7 @@ private:
     /// edge zone descriptors, owned by pointer.
     ZONE_CONTAINERS     m_ZoneDescriptorList;
 
-    LAYER               m_Layer[NB_COPPER_LAYERS];
+    LAYER               m_Layer[LAYER_COUNT];
                                                     // if true m_highLight_NetCode is used
     HIGH_LIGHT_INFO     m_highLight;                // current high light data
     HIGH_LIGHT_INFO     m_highLightPrevious;        // a previously stored high light data

pcbnew/class_track.cpp

@@ -186,6 +186,7 @@ wxString SEGZONE::GetSelectMenuText() const
 SEGVIA::SEGVIA( BOARD_ITEM* aParent ) :
     TRACK( aParent, PCB_VIA_T )
 {
+    SetShape( VIA_THROUGH );
 }