obj change to support some upcoming work

obj change to support some upcoming work

This is an enabling patch for upcoming work. It breaks
save/bones so editlevel is incremented.

I'd like to a second overloadable int field in struct obj,
instead of just the one that is typically overloaded - corpsenm.

The second one can be used for things that are being tallied
up as opposed to a static one time assignment for reference/linkage
purposes.

The differentiation will allow both uses to co-exist for the
same object.