message: BUGFIX: fix error message in Plane class
  The "<<" takes precedence over the "?" operator leading to
  an erroneous error message. Fixed that by encapsulating the
  "?" expression in parenthesis.
diff: @@ -325,9 +325,8 @@ Plane< T, NDIMS >::Plane( const T* x1, const T* x2, const T* x3 )
  degenerate = degenerate && utilities::isNearlyEqual( m_normal[i], 0.0 );
  }
  - SLIC_ERROR_IF(
  - degenerate,
  - "Supplied points form a degenerate " << (NDIMS==2 ? "line" : "triangle") );
  + SLIC_ERROR_IF( degenerate,
  + "Supplied points form a degenerate " << ( (NDIMS==2)?"line":"triangle" ) );
  numerics::normalize( m_normal, NDIMS );
  m_offset = numerics::dot_product( m_normal, x1, NDIMS );
  @@ -336,7 +335,9 @@ Plane< T, NDIMS >::Plane( const T* x1, const T* x2, const T* x3 )
  //------------------------------------------------------------------------------
  template < typename T, int NDIMS >
  Plane< T,NDIMS >::~Plane( )
  -{}
  +{
  +
  +}
  //------------------------------------------------------------------------------
  template < typename T, int NDIMS >
  