A couple of grace problems

[Mats Bengtsson]

I noted a couple of problems with grace notes, see the 
following example:

\score{
  \notes\relative c''\context Voice {
    \property Score.autoBeamSettings \override #'(end 1 8 4 4) = #(make-moment 
1 4)                  
    % Misplaced slurs:
    f8 \grace {f (}) g a bes a \grace{ a ( } ) g a f |

    % Impossible to get beam over both main notes and grace notes:
    a \grace{[g16 ( f] } ) g8
  }
}


  /Mats