[Rivet] Plotting defaults again

[Frank Siegert]

Hi all,

Since Andy asked today whether I have anything that I'd want to go into 
an imminent release...

Almost all of my plots have a log-y axis. But the default label 
separation isn't large enough to separate the ylabel from the 10^-n tick 
labels. I had to use:

-            ylabelsep=5.3
+            ylabelsep=6.5

and

-            leftmargin = 1.25
+            leftmargin = 1.4

in all of the plots in http://arxiv.org/abs/1009.1127 for example.

What do you think, would it be worth changing this default? Either in 
make-plots (my preference) or through compare-histos...?

Cheers,
Frank