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

MFC r261296:

Merge from CheriBSD:
commit c1acf022c533c5ae27e0cd556977eafe3f5959eb
Author: Brooks Davis <brooks@one-eyed-alien.net>
Date: Fri Jan 17 21:46:44 2014 +0000

Add an option WITHOUT_NCURSESW to suppress building and linking to
libncursesw. While wide character support it useful we'd like to
only need one ncurses library on embedded systems.

Sponsored by: DARPA, AFRL

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

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

Add some missing DPADD.

Fix segfault if distfetch and distextract binaries are run standalone
without the DISTRIBUTIONS environment variable set.

PR: bin/165492
Submitted by: Fernando Apesteguia
MFC after: 4 days

Plug memory leaks and fix open(2) error check.

Reviewed by: nwhitehorn
MFC after: 3 days

Add some error checking on the return values of chdir() and calloc(). The
first might actually happen, so it displays the error message in a prettier
way.

Found by: Coverity Prevent(tm)
CID: 9121, 9122, 9123, 9124

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!