chords grid

[douwen elo]

hi
i am Sacha, new user of Lilypond
i wanted to suggest you the implementation of something very simple in Lilypnd 
to get Chord grids
for example a \Chordgrid (width= height = number of raws = number of columns =) 
{a/c b:7} etc
that would be very useful
Xavier worked for me and managed to get a grid to whom it misses one line...
and his code was (i find) very complicated
regards
Sacha