possible bug (PR#91)

bug.report:
=====================
Version:
 platform = i586-unknown-linux
 arch = i586

...

1. 
bug.report() gives above information: however, my computer is a 486,
not 586, but I am not knowldedgeable enough to tell whether
bug.report() or the operating system is the optimist.

Your OS is the optimist, and R is not checking during configure. 
You may lose a little efficiency from this, but it's relatively 
harmless. Recompile your kernel with the right CPU setting if it bothers you.

2.
It would be helpful if help(bug.report) showed how to exit
bug.report() back to R. 

Hmm. It dumps you into your favourite editor, as specified in options()$editor,
and how to get out of that is editor-dependent... Not much we can do about that,

I'm afraid (or can we?). The bug.report() interface got cleaned up
substantially, 
by the way.

3.
Using "expression" as ylab or xlab parameter of plot(): label is not
centered (too high or too far to the right); this is particularly
obvious if, e.g., margins are set wide:

e.g., with:

par(mai=c(1.8,2,1.8,2))

I padded the label with spaces to approximately center it:

ylab=expression(paste("[Ca]"[i]," (nM)                            ")

Still with us, I'm afraid. Don't see the mai= thing, though, but

 plot(1:3,ylab=expression(paste("[Ca]"[i]," (nM) "))) 

shows the effect badly enough.

Moving PR to "graphics"
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