Version Control With Subversion Source

Factor out some duplication into a common file.

* tools/base-html-stylesheet.xsl:
New file, containing bulk of old content from...

* tools/html-stylesheet.xsl:
* tools/chunk-stylesheet.xsl:
...these, which <xsl:include> the base file.

Remove the empty colophon.

* en/book/book.xml: Remove entity include.
* en/book/colo.xml: Delete.

* tools/chunk-stylesheet.xml: Turn off fast chunking again. It *was* faster,
but seems to cause the "Next" and "Previous" links to omitted. I'm not
sure whether that is considered a bug or a feature by the DocBook project.

Merging others' changes into your working copy is done with "svn update", not
"svn merge". Reported by Luke Worth <luke@...>.
Also clarify exactly what is being merged.

* en/book/ch03.xml (svn-ch-3-sect-5): Fix.

Book Spanish. Translated two paragraphs.

Book Spanish. Translated four paragraphs.

* src/en/book/ch09.xml (svn-ch-9-sect-6.1.2): Fix xml markup errors
that sussman pointed out.

Add a section to Chapter nine listing the Apache configuration
directives for Subversion.

* src/en/TODO: update.
* src/en/book/ch09.xml (svn-ch-9-sect-6): New section of Apache directives.

Add HACKING policy about line length.

Fix false statement about location of book source.
Reported by Gissehel <gissehel-svnbook@...>.

* en/book/ch00.xml (svn-ch-0-sect-5): Re-word.