Version Control With Subversion Source

More stylesheet tweaks.

Kill all named fonts in our HTML stylesheets. Let the user's
preferences win. While here, switch to serif'ed fonts for the body.

* src/en/book/ch06-server-configuration.xml
Re-add periods to a set of list items for consistency with the five
other similar, neighboring lists. Also, don't say "CGI software"
because not all repository browsing software technically uses the CGI
interface.

Add another special character.

* src/en/book/ch04-branching-and-merging.xml
Rework helpful table to a) not have trailing periods in the left
column, and b) use proper tagging in the right one.

Convert icon descriptions back to full sentences.

Tweak-a-word here, tweak-a-word there, tweak-a-word everywhere.

More work to try to make our HTML stylations match the way O'Reilly
renders text.

* src/en/book/styles.css
Override <strong> tags -- we have no markup that should be
generating bold text. Italicize commands. Shrink the fonts in
admonishments.

* src/en/book/ch00-preface.xml
Rework the 'Conventions' section to not break into subsections
(which is what we think the copyeditor probably meant when she
struck out the printed titles of those subsections).

More little fixes found while porting changes to the ORA tree.