Version Control With Subversion Source

* en/book/ch00-preface.xml
Minor wording tweaks.

* en/book/styles.css
Make footnote text a bit smaller.

For issue 153 ("References: Consider using DocBook's <refsynopsisdiv>
and related markup") use <refsynopsisdiv> throughout the references.

* en/book/ref-reposhooks.xml,
* en/book/ref-svn.xml,
* en/book/ref-svnadmin.xml,
* en/book/ref-svndumpfilter.xml,
* en/book/ref-svnlook.xml,
* en/book/ref-svnmucc.xml,
* en/book/ref-svnrdump.xml,
* en/book/ref-svnserve.xml,
* en/book/ref-svnsync.xml,
* en/book/ref-svnversion.xml
Use <refsynopsisdiv> throughout instead of a hardcoded <refsect1>
with a <title>. While here, consistify formatting of the reference
entry front matter sections and divider comments.

* en/book/ref-svnmucc.xml
Lead off this reference talking about what svnmucc is rather than
what svn isn't.

Suggested by: danielsh

* en/HACKING
Document another exception on the index term formatting.

* en/book/ref-svn.xml,
* en/book/ref-svnsync.xml,
* en/book/ref-svnversion.xml
Indentation/whitespace/comment tweaks only.

* en/book/ref-svnrdump.xml
Indentation/whitespace/comment tweaks only.

* en/book/ref-svnmucc.xml
Indentation/whitespace/comment tweaks only.

* en/book/ref-svnmucc.xml
Add part intro.

* en/book/ref-svnlook.xml
Remove line breaks from the options list terms. They render ugly.