where can one find the default settings

[Kieren MacMillan]

[Lilypond 2.11.49]

Hello all!

Just wondering if there's any documentation on where to find the  
default settings for a given grob — for example, I don't know where  
to look to find the default BreathingSign #'font-size setting (which  
I need right now). [I can easily drill down to the font-interface  
page, but no specific answer can be found there, because it's an  
interface shared by so many different grobs...]

Once again, I would like to suggest that all settings for a given  
grob should be available in a single documentation page — e.g., the  
grob LayoutObject page — so that users don't have to hunt them down  
in fourteen different places, assuming they even know where to look  
to begin with. [This list of settings should be *automatically*  
generated, of course, so that no one would have to manually build it  
for each new Lilypond version...]

Thanks,
Kieren.