Version Control With Subversion Source

* www/index.es.html: Updated web page to match English revision 2091.

* www/index.pt_BR.html
Reflect changes from index.en.html in r2049 and move existing
translation note to the newly created special region for
translation notes (see r2079).

* book/ch07.xml
(svn:eol-style): Fix typo. Put term 'operating system' in plural form.

* www/index.nb.html: Add a <base href> element to make remote editing of
the file more realistic.

Sync the Norwegian and English web page.

* www/index.nb.html: Updated r2054:2087 from index.en.html .

* www/index.en.html: Update the front page to mention downloadable tarballs.
Also correct some sizes.

Propagate HTML archive support.

* src/tools/book-dist.py
* src/tools/build-nightlies

Implement HTML tarball creation targets.

* src/tools/Makefile.base-vars
(ARCH_CMD, ARCH_EXT, HTML_ARCH_BASENAME, HTML_CHUNK_ARCH_BASENAME,
HTML_ARCH_TARGET, HTML_CHUNK_ARCH_TARGET): New variables.

* src/tools/Makefile.base-rules
(html-arch, html-chunk-arch, install-html-arch, install-html-chunk-arch):
New targets.
(clean): Adjust.

* src/tools/build-nightlies: Remove redundant 'import os.path'.
Remove 'import string', and convert only use of legacy string module to
modern form.
Tighten regions which run with a changed working directory, and handle
reversion to the initial working directory more rigourously, so that
relative paths function correctly as arguments.

Book Spanish. Translated four paragraphs.