MFC r245177,r245346,r246283,r251650:

- Set WITHOUT_SVN=yes for textproc/docproj.
- Add CHECKSUM.* support in Makefile.
- Use ln -fs to create a symlink.
- Remove pkgadd for docports.
- Use WITHOUT_JADETEX=yes instead of WITH_JADETEX=no.
- Add {WORLD,KERNEL}_FLAGS to [BTWK]MAKE.
- Use makefs(8) and gpart(8) for sparc64 ISO image.
- Add publisher option to makefs(8).
- Add missing copyright notice.
- ISO 9660 specification allows only "d-characters" and "a-characters"
  in the Volume Descriptor (section 7.4).  In short, uppercase
  alphanumeric + some symbols only.  While the makefs utility automatically
  converts the characters, $LABEL should be consistent in the scripts.

These fix a specification violation in 9.X iso9660 images, and cdrtools
dependency and endianness issue for sparc64 release media.  The label is
now in uppercase letters only in all platforms.
Remove obsolete translations.
MFC r250746 and r250805:

- Update the release notes to DocBook 4.5 XML to build with the
  updated documentation tree
- Fix build after doc/projects/xml-tools integration.