New trellis settings

Specifically, I have some code that in the past changed the relative
proportions of text versus the plot area using:

  trellis.par.set('fontsize', list(text=8))

which caused all text to get smaller, and the plot area to grow to
fill the larger available space.  Now, the plot area does not grow on
its own.  

That does seem to have been a side-effect in 1.9.1, but it was never 
intended. I would consider that behaviour a bug, not a feature.

str(trellis.par.get()$layout.heights)

List of 18
 $ top.padding      : num 1
 $ main             : num 1
 $ main.key.padding : num 1
 $ key.top          : num 1
 $ key.axis.padding : num 1
 ...

I was hoping that the names would be enough of a hint. Anything with 
'padding' in the name is space, and probably the ones you want to 
change.