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

Improve error handling and remove an unnecessary check on geom provider
type. GEOM provider names can't duplicate (or shouldn't -- devfs will either
break or only use the first one if they do) so using the first provider
by that name is a sufficient check. This also lets the scripted partitioner
install onto gmirror and geli and such things.

If no partition configuration is specified in {}, use the automatic setup
the interactive installer uses.

Example: bsdinstall scriptedpart ada0
Result: Use entire disk for a FreeBSD system with default partition layout

Remove variables which are initialized but never used thereafter reported by gcc46 warning

Approved by: cperciva
MFC After: 3 days

Work around some behavior of gpart that I absolutely do not understand in
order to make every operation of the partition editor fully revertable.
Under *no circumstances* will it any longer touch the disks until the user
presses Finish and confirms it.

MFC after: 3 days

Implement support for GRAID volumes in the installer partition editor,
rename a few options, clarify some help text, and add help text for the
buttons on the main partition editor screen.

Approved by: re (kib)

Show disk model numbers in partition wizard screen. Also, since da(4) disks
are probably more likely to be USB or Firewire these days than SCSI, just
call them and anyone unknown "Disk" instead of SCSI disk.

Add a catch-all for miscellaneous RAID volumes while seeking a better
solution here. It would really help if CAM devices were part of newbus.

Don't present the user with spurious errors when overwriting a disk with
a deleted, but uncommitted, gpart.

Reported by: brucec

Import bsdinstall. This is meant to be (eventually in conjunction with
pc-sysinstall) a replacement for sysinstall in the 9.0 release and beyond.
Currently supported platforms are sparc64, pc98, i386, amd64, powerpc, and
powerpc64. Integration into the build system will occur in the coming
weeks.

Merging with pc-sysinstall will use this code as a frontend, while
temporarily retaining the interactive partition editor here. This work
will be done in parallel with improvements on this code and release
integration.

Thanks to all who have provided testing and comments!