Plot pad outlines on Fab files: fix many issues. Depending on

plotter type and pad type, the plotted shapes were not always the outlines,
but a outline inside the pad shape (due to legacy reasons). In many cases the
plotted shape was in fact incorrect. Now the actual pads outlines are plotted
without modification.
From Master branch

common/plotters/GERBER_plotter.cpp

@@ -1252,7 +1252,7 @@ void GERBER_PLOTTER::FlashPadCircle( const wxPoint& pos, int diametre, OUTLINE_M
 
         SetCurrentLineWidth( USE_DEFAULT_LINE_WIDTH );
 
-        Circle( pos, diametre - m_currentPenWidth, FILL_T::NO_FILL, DO_NOT_SET_LINE_WIDTH );
+        Circle( pos, diametre, FILL_T::NO_FILL, DO_NOT_SET_LINE_WIDTH );
     }
     else
     {
@@ -1372,10 +1372,8 @@ void GERBER_PLOTTER::FlashPadRect( const wxPoint& pos, const wxSize& aSize,
                 formatNetAttribute( &gbr_metadata->m_NetlistMetadata );
 
             SetCurrentLineWidth( USE_DEFAULT_LINE_WIDTH );
-            Rect( wxPoint( pos.x - (size.x - GetCurrentLineWidth()) / 2,
-                           pos.y - (size.y - GetCurrentLineWidth()) / 2 ),
-                  wxPoint( pos.x + (size.x - GetCurrentLineWidth()) / 2,
-                           pos.y + (size.y - GetCurrentLineWidth()) / 2 ),
+            Rect( wxPoint( pos.x - ( size.x / 2 ), pos.y - ( size.y / 2 ) ),
+                  wxPoint( pos.x + ( size.x / 2 ), pos.y + ( size.y / 2 ) ),
                   FILL_T::NO_FILL, GetCurrentLineWidth() );
         }
         else
@@ -1445,7 +1443,6 @@ void GERBER_PLOTTER::FlashPadRoundRect( const wxPoint& aPadPos, const wxSize& aS
                                               0.0, 0, 0, GetPlotterArcHighDef(), ERROR_INSIDE );
 
         SetCurrentLineWidth( USE_DEFAULT_LINE_WIDTH, &gbr_metadata );
-        outline.Inflate( -GetCurrentLineWidth()/2, 16 );
 
         std::vector< wxPoint > cornerList;
         // TransformRoundRectToPolygon creates only one convex polygon
@@ -1657,7 +1654,6 @@ void GERBER_PLOTTER::FlashPadCustom( const wxPoint& aPadPos, const wxSize& aSize
     if( aTraceMode != FILLED )
     {
         SetCurrentLineWidth( USE_DEFAULT_LINE_WIDTH, &gbr_metadata );
-        polyshape.Inflate( -GetCurrentLineWidth()/2, 16 );
     }
 
     std::vector< wxPoint > cornerList;