Remove unnecessary copy ctors/copy assignment operators

C++11 deprecates having one without the other.
Eliminates many, many GCC -Wdeprecated-copy warnings.

include/wx/generic/grid.h

@@ -635,16 +635,6 @@ public:
     void SetCol( int n ) { m_col = n; }
     void Set( int row, int col ) { m_row = row; m_col = col; }
 
-    wxGridCellCoords& operator=( const wxGridCellCoords& other )
-    {
-        if ( &other != this )
-        {
-            m_row=other.m_row;
-            m_col=other.m_col;
-        }
-        return *this;
-    }
-
     bool operator==( const wxGridCellCoords& other ) const
     {
         return (m_row == other.m_row  &&  m_col == other.m_col);