Unduplicate logic

[wyld-sw]

Many pieces of code rely on the same (or very similar) logic, which could be consolidated.

This is the case for internal code (e.g., copying properties), server commands (e.g., do_clone vs. prim_clone) and MPI (e.g., mfn_instr vs. prim_instr).

Several examples exist of this. This issue is one option for tracking the planning and completion of work. Feel free to suggest strategies or other ways to track this.