Version Control With Subversion Source

Rename appd.xml to appc.xml.

Rename appc.xml to appb.xml.

So long, Appendix B. We don't do information redundancy any more.

* src/en/book/appb.xml
Deleted.

* src/en/book/book.xml
No longer pull in appb.xml.

* src/en/book/ch09.xml
Don't xref to the FAQ any more.

* src/en/book/ch07.xml: continue fleshing out locking section.

Book Spanish. Translated two paragraphs.

Minor fixes. Patch by Chris Pepper <pepper@...>.

* src/en/book/ch05.xml
(Berkeley DB): s/clean/cleans/ (subject-verb agreement);
s/BerkeleyDB/Berkeley DB/
(FSFS): s/time-out/time out/ (I believe this is more appropriate,
but both are common usage).

* src/en/TODO
Remove the TODO about the new revprop hook action arguments
and stdin utility -- the book doesn't cover hooks in that
level of detail because the hook templates are self-describing.

Document the --ignore-externals option for svn's checkout,
export, update, and status subcommands.

* src/en/TODO
Finish a TODO.

* src/en/book/ch07.xml
(Externals Definitions): Mention that you can use the option
to disable externals definition handling.

* src/en/book/ch09.xml
Describe the --ignore-externals option, and note its availability
for the svn subcommands. Also, note the availability of the
--use-pre-hook-script and --use-post-hook-script options to
svnadmin load (which I missed in my last commit).

Document the --use-pre-commit-hook and --use-post-commit-hook
options to 'svnadmin load'.

* src/en/TODO
Finish a TODO.

* src/en/book/ch05.xml
(Migrating a Repository): Document the use of the options.

* src/en/book/ch09.xml
(svnadmin): Describe the options.

* src/en/book/ch07.xml
(Locking): start fleshing out the new locking section.

* src/en/book/ch02.xml
(When Locking is Necessary): fix wording.