the size of the rendered release notes. By default, any element with
a role="historic" attribute won't get rendered in the output unless
the INCLUDE_HISTORIC Makefile variable is defined.
version control information that is different from the rest of their
containing document (or at least other sections). For release notes
only, allow output of <sect1info><pubdate></pubdate></sect1info>
text, and add it to three sections of RELNOTESng where it's kind of
important ("What's New" in the release notes, "Supported Device" in
the arch-independent hardware list, and the processors section of the
alpha hardware list).
1. There is now only one RELNOTESng stylesheet; the architecture-specific
stylesheets (to handle different values of the arch= attribute) are gone.
2. Several Makefile variable definitions were factored into
doc.relnotes.mk.
Submitted by: dd
