problem with Paper_column_engraver::make_columns ()

[Erik Sandberg]

Hi,

I'm now changing the initialisation of now_mom and prev_mom to -inf. This has 
lead to the discovery of a small bug: Paper_column_engraver::make_columns () 
is called when the Score context is created, and it timestamps itself with an 
uninitialised now_mom. I suspect this means that the spacing of the first 
system is slightly displaced when a piece starts with a grace note. 

I need to fix this bug before I can go on with my work, but I know too little 
about paper columns to know what the proper solution is. Any ideas?

-- 
Erik