#12 renum function for area's

[Anonymous]

need a function to renumber areas, say if an area is
16000-16099 you could renum it 15000-15099 or 0-99.
Basically by copying the whole area file to a
different name and assigning the new numbers in the
same order
need to be able to keep linked rooms linked
need to be able to transfer mobs and items as well
but i want the old area to still be there.