Version Control With Subversion Source

* 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.