This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.
Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.
you still need tohave done a make world and have made 'sysinstall'
this should not interfere with existing code as it's standalone.
write_mfs_in_kernel.c is duplicated alsewhere.. one will go ..