Migrated the interfaces accepting angles to the double type

The plan goes like this:
- eeschema still uses int in decidegrees
- all the other things internally use double in decidegrees (or radians
  in temporaries)
- in pcbnew UI the unit is *still* int in decidegrees

The idea is to have better precision everywhere while keeping the user with int i
angles. Hopefully, if a fractional angle doesn't come in from the outside, everything
should *look* like an integer angle (unless I forgot something and it broke)

When the time comes, simply updating the UI for allowing doubles from the user should
be enough to get arbitrary angles in pcbnew.

common/common_plotPS_functions.cpp

@@ -64,7 +64,7 @@ void PSLIKE_PLOTTER::SetColor( EDA_COLOR_T color )
 }
 
 
-void PSLIKE_PLOTTER::FlashPadOval( const wxPoint& pos, const wxSize& aSize, int orient,
+void PSLIKE_PLOTTER::FlashPadOval( const wxPoint& pos, const wxSize& aSize, double orient,
                                    EDA_DRAW_MODE_T modetrace )
 {
     wxASSERT( outputFile );
@@ -115,7 +115,7 @@ void PSLIKE_PLOTTER::FlashPadCircle( const wxPoint& pos, int diametre,
 
 
 void PSLIKE_PLOTTER::FlashPadRect( const wxPoint& pos, const wxSize& aSize,
-                                   int orient, EDA_DRAW_MODE_T trace_mode )
+                                   double orient, EDA_DRAW_MODE_T trace_mode )
 {
     static std::vector< wxPoint > cornerList;
     wxSize size( aSize );
@@ -159,7 +159,7 @@ void PSLIKE_PLOTTER::FlashPadRect( const wxPoint& pos, const wxSize& aSize,
 
 
 void PSLIKE_PLOTTER::FlashPadTrapez( const wxPoint& aPadPos, const wxPoint *aCorners,
-                                     int aPadOrient, EDA_DRAW_MODE_T aTrace_Mode )
+                                     double aPadOrient, EDA_DRAW_MODE_T aTrace_Mode )
 {
     static std::vector< wxPoint > cornerList;
     cornerList.clear();
@@ -471,8 +471,8 @@ void PS_PLOTTER::Circle( const wxPoint& pos, int diametre, FILL_T fill, int widt
 }
 
 
-void PS_PLOTTER::Arc( const wxPoint& centre, int StAngle, int EndAngle, int radius,
-                      FILL_T fill, int width )
+void PS_PLOTTER::Arc( const wxPoint& centre, double StAngle, double EndAngle, 
+                      int radius, FILL_T fill, int width )
 {
     wxASSERT( outputFile );
     if( radius <= 0 )
@@ -805,7 +805,7 @@ bool PS_PLOTTER::EndPlot()
 void PS_PLOTTER::Text( const wxPoint&              aPos,
 		       enum EDA_COLOR_T            aColor,
 		       const wxString&             aText,
-		       int                         aOrient,
+		       double                      aOrient,
 		       const wxSize&               aSize,
 		       enum EDA_TEXT_HJUSTIFY_T    aH_justify,
 		       enum EDA_TEXT_VJUSTIFY_T    aV_justify,