extract cell numbers from raster along a line

I'd like to extract celle numbers from a raster using a line, but it seems 
the cellnumbers=TRUE option isn't working with lines in raster::extract. 

Etienne, 

It is not working because "cellnumbers" is currently only an argument for
extracting values from a Raster* for polygons. That's what the docs say. But
I'll also implement if for lines.  

In your example it is easy to extract cell numbers for the line

r[] = 1:ncell(r)
extract(r, l) 

[[1]]
[1]  4  5  8  9 12 13 16 17

I'm also not sure I get the order in which the values are returned, but it
seems
 it is not from the begining of the line to the end or reverse. 

The values are first in row order, and then in column order.  Not in the
order of the coordinates of the line(s).

Robert

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