Version Control With Subversion Source

* src/en/book/ch06-server-configuration.xml
Add warning about case-insensitive comparison of authz access file
section headers, with a note to remove this again in the 1.7
version. (See issue #22.)

Finish issue #80 ('ch04: Incorrect definition of revision').

* src/en/book/ch04-branching-and-merging.xml
(svn.branchmerge.using): Make language about revisions
consistent with that in svn.basic.in-action.revs.

* src/en/book/ch04-branching-and-merging.xml
Grr. Fix an XML tag typo.

* src/en/book/ch04-branching-and-merging.xml
Continue stomping all over Paul's text with more markup and phrasing
tweaks. (I really should hold off on this until my post-issue-sweep
read-thru.)

* src/en/book/ch04-branching-and-merging.xml
Markup corrections only.

* src/en/book/ch04-branching-and-merging.xml
(svn.branchmerge.nomergedata): Tweak wording a bit, we merge
from a target's history, not to it.

Finish issue #74 ('Term "natural history" lacks definition/
explanation').

* src/en/book/ch04-branching-and-merging.xml
(svn.branchmerge.nomergedata): Add a sidebar with a brief
description of natural history/implicit mergeinfo. Resist
urge to over-explain.

* src/en/book/ch06-server-configuration.xml
(svn.serverconfig.httpd.ssl): Reorganize and expand the SSL
documentation.

Patch by: quinntaylor@...
(Incorporating matererial from christophe.nanteuil@...)
(Tweaked by me.)

Relocate a book section.

* src/en/book/ch06-server-configuration.xml
(svn.serverconfig.httpd.authn): Add a tip which points to the SSL
section.
(svn.serverconfig.httpd.ssl): Move this section down below the
Authentation section.

Patch by: quinntaylor@...
(Tweaked by me.)

* src/en/book/ch03-advanced-topics.xml
Minor typo fix.

Patch by: Mathias Weinert <wein@...>