r11447: major reworking of mop internals to support OpenMCL.

r11447: major reworking of mop internals to support OpenMCL.
Now, rather than doing all computation at the time of finalize-inheritance, certain slot processing is done via
shared-initialize so that slots (like user-name) always have a valid value. Otherwise, OpenMCL would complain slot was
invalid at time of instance creation, before finalize inheritance.