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

Use a cast that doesn't create a compiler warning.

Use __FBSDID() to quiet GCC 3.3 warnings.

Implement the option to disable IPv6 on an sppp interface (counterpart
to the kernel code just committed).

MFC after: 1 month

Clean up half a dozen of header files that are no longer needed now that
we use struct sppp_parms instead of struct sppp for userland programs.

MFC after: 1 month

Userland part of making the LCP restart timer configurable.

Obtained from: i4b (with changes)

Implement knobs to enable/disable VJ header compression.

Submitted by: i4b (modified)
MFC after: 1 month

Include missing header files which define functions for which gcc has
builtins (e.g., exit, strcmp).

$Id$ -> $FreeBSD$

Make buf in authflags a little bigger because 2 strings can be
concatenated and 20 bytes (the old size) is kind of tight.

Make the buf in authflags big enough to hold " norechallenge". I've been
running with this for a few weeks.

Submitted by: someone on the freebsd-isdn maillist

Typo: i. e. -> i.e.
Remove unused #include.

Remove more unused #includes.
Obtained from: Bruce.

Add rcsid. Remove uneeded #include. Use fprintf() in usage() instead of err(3)
to make it print: usage: progname ...

This commit was generated by cvs2svn to compensate for changes in r30302,
which included commits to RCS files with non-trunk default branches.

The spppcontrol(8) utility that is required to set or display things
like PAP and CHAP secrets with sppp(4). This is the first utility
using the new SIOC[SG]IFGENERIC ioctls (and the reason for inventing
them in the first place).