Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Add files needed for PPC release ISOs. These are built with the
HFS/ISO9660 extensions to be bootable on Power Macs.

boot.tbxi - the CHRP script executed by Open Firmware when auto-booting
CDs
hfs.map - map Unix files to HFS creator/type fields

Reviewed by: ru
Submitted by: ssouhlal