Mini Shell

- x86 handle x86 vmlinux parameter header allocation issues.
  There is a bug where it can get stomped but the current code
  does not allow us much flexibility in what we do with it.
- Restore enough state that DOS/arbitrary BIOS calls can be run on some
  platforms.  Currently disk-related calls are quite likely to blow up.
- x86 filling in other kernel parameters.
- Merge reboot via kexec functionality into /sbin/reboot
- Improve the documentation 
- Add support for loading a boot sector
- Autobuilding of initramfs
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