Org element cache in indirect buffers

[Sebastian Wålinder]

Hello!

It appears that indirect buffers duplicate the entire org element cache from 
the base buffer whenever created.

Running `memory-report` indicates that each indirect buffer has the same memory 
blueprint.

This becomes a massive issue with large org files.

My in my 160 000 line org file, the org element cache takes 100 mb, and so each 
new indirect buffer consumes an additional 100 mbs of memory.

I also wonder if this means the caching is performed by each indirect buffer 
independently, and doesn't carry over.

Thoughts?

Thanks,
Sebastian