Large objects names

Currently, large objects are stored internally as xinv### and xinx###.

I would like to rename this for 6.4 to be _lobject_### to prevent
namespace collisions, and make them clearer for administrators.

However, this may cause problems for backward compatability for large
object users.  As I see there are going to be other new large object
things in 6.4, it may not be an issue.

Is is OK to rename them internally?

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