static access to multicore?

[Ryan McKinley]

I'm trying to write a search component that queries another core.
This pointed out that there is no way to access MultiCore outside of  
SolrDispatchFilter.

If we were using spring, we could easily pass that reference into the  
component.  Without it, I think the best option is to add a static  
'instance' variable on MultiCore.  It will go away when we have some  
other option (spring).

thoughts?
ryan