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

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

Updates for netgraph node manual pages.

Discussed with: glebius
Submitted by: Mamontov Roman <mr.xanto@gmail.com>

Globally replace u_int*_t from (non-contributed) man pages.

The reasoning behind this, is that if we are consistent in our
documentation about the uint*_t stuff, people will be less tempted to
write new code that uses the non-standard types.

I am not going to bump the man page dates, as these changes can be
considered style nits. The meaning of the man pages is unaffected.

MFC after: 1 month

Rewrite node to support multiple hooks, alike to ng_l2tp, to use one pair
of pptpgre and ksocket nodes for all calls between two peers.

Verify that SYNOPSIS section compiles.

Sort sections.

Add 'enableWindowing' configuration knob to the ng_pptpgre(4) netgraph node.

Submitted by: Michael Bretterklieber <mbretter@a-quadrat.at>
MFC after: 2 weeks

Typo: s/acknowlegement/acknowledgement/

Ispell sweep of share/man/man4.

mdoc(7) police: bump document date, fix markup.

Document the 'enableAlwaysAck' field in the config structure.

mdoc(7) police: Use the new .In macro for #include statements.

Removed whitespace at end-of-line; no content changes. I simply did
cd src/share; find man[1-9] -type f|xargs perl -pi -e 's/[ \t]+$//'

BTW, what editors are the culprits? I'm using vim and it shows
me whitespace at EOL in troff files with a thick blue block...

Reviewed by: Silence from cvs diff -b
MFC after: 7 days

mdoc(7) police: removed HISTORY info from the .Os call.

mdoc(7) police: remove extraneous .Pp before and/or after .Sh.

mdoc(7) police: in mdocNG, -offset and -width values without scaling
indicator are treated as strings, so "-offset 0" will set the offset
to the width of the string "0", as opposed to "no offset".

TIP: if offset is not needed, the -offset clause may be omitted.

Update @freebsd.org email addresses to @FreeBSD.org as is the
precedent.

Change archie's and my email addresses from Whistle.com to FreeBSD.org

AUTHOR -> AUTHORS

Document the new statistics control messages.
Add a note about the IP header asymmetry on the "lower" hook.

Move netgraph node type man pages from section 8 to section 4.

Correct man page title.

Manual page style work.
Submitted by: Alexey Zelkin <phantom@FreeBSD.org>
thanks!

Add reference to RFC 1702, after learning how to have "T. Li"
as an author without nroff blowing up.

Problem solved by: fenner

New netgraph node type 'pptpgre': this performs GRE encapsulation
for the PPTP protocol as specified in RFC 2637.