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

Fix build after doc/projects/xml-tools integration.

- Rename .sgml files to .xml to track the recent doc changes

MFC after: 1 day

It'd be kind of nice if we installed the hardware notes to their
own directory, rather than overwriting the release notes. :-p
Fix this.

Pointy hat to: bmah

Switch to unified MI hardware notes. The hardware notes are
now contained entirely in a single DocBook article, which has
information pertinent to all architectures. This will improve
the maintainability of the hardware notes going forward by
reducing complexity of the build process, improving the visibiilty
of the architecture-specific text, and removing the need to generate
an extra version of the document for every architecture.

Remove all of the MD hardware notes stuff; all relevant content
has been folded into hardware/article.sgml.

No objections from: freebsd-doc@

Add the bones for PowerPC release documentation. This has been
derived from ia64.

Prepare to shoot my own dog, decouple the alpha docs from the build.

Commit amd64 MD release documentation stubs and hook up to the build.
Content will be filled in later as needed, but this should unbreak
the doc part of an amd64 release build.

Requested by: peter

Connect the ia64 versions of the release documentation to the RELNOTESng
build.

This will give ia64 folks the chance to help flesh these out, and
also ensure that (when the time comes) ia64 releases with documentation
won't fall over due to missing RELNOTESng files.

Add/Update hardware, installation and relnotes documentations for pc98.

Submitted by: NAKAJI Hiroyuki <nakaji@tutrp.tut.ac.jp> and nyan
Reviewed by: bmah

Add some basic FreeBSD/sparc64 Hardware Notes.

Reviewed by: jake, tmm

Build system:
o Define a RELN_ROOT variable which points to the root of the relnotes
tree (i.e., src/release/doc).
o By default, define DOC_PREFIX in terms of RELN_ROOT; this gives a
bigger chance of finding the doc/ tree without help in the form of
setting DOC_PREFIX on the command line.
o Respect DOCDIR; `make install` works now.

Approved by: bmah

First commit of RELNOTESng, the rewrite of the *.TXT documentation
files.

src/release/doc/README has additional information.

Reviewed by: -current, -doc