libctf: Handle CTFv3 containers

In general, the patch adds indirection to minimize the amount of code
that needs to know about differences between v2 and v3. Specifically,
some new ctf_get_ctt_* functions are added, and new LCTF_* macros are
added to use the underlying container's version to do the right thing.

CTF containers can have parent/child relationships, wherein a type ID in
one container refers to a type in the parent. It is permitted for the
parent and child to have different versions.

MFC after: 1 month
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D34363

libctf: Remove checks for CTFv1

Per commit 7db423d69273 ("libctf: Rip out CTFv1 support") this support
is obsolete.

MFC after: 1 week
Sponsored by: The FreeBSD Foundation

libctf: Rip out CTFv1 support

CTFv1 was obsolete before libctf was imported into FreeBSD, and
ctfconvert/ctfmerge can emit only CTFv2. Make ctf.h a bit easier to
maintain by ripping v1 support out. No functional change intended.

MFC after: 1 week
Sponsored by: The FreeBSD Foundation

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

- Import the HEAD csup code which is the basis for the cvsmode work.