provides the correct functions for primary, secondary, and unified
boot blocks. actually behave correctly (e.g. expect correct arguments,
perform correct operations) depending on which you are. also
some minor cleanup.
had a few bugs fixed that let the problem slip in, and since bootxx's
Makefile now goes out of its way to satisfy installboot's undocumented
and totally unreasonable assumptions about the bootxx file it's operating
on. No point in fixing the assumptions, because sooner rather than later
this incarnation of installboot is going to die.
