Define upper size limit for objects in DPDD

From a Robert Lupton comment in LDM-151:

We need to define what we'll do with objects that are too large to fit in a single patch, even with overlaps

The simplest proposal is that we simply won't try to process them as single objects, but I think this is a question whose answer belongs in the DPDD. If we need to process objects up to a certain scale, that either puts a requirement on our patch sizes or will require special code to process them.