Version Control With Subversion Source

- Fixed email address.

* src/de/book/ch02-basic-usage.xml
- Incorporated changes of Jens M. Felderhoff
- Ticket #56-#62, #94 for the german
book translation.

One more thing in Chapter 9, thanks to Karl Heinz Marbaise
(khmarbaise@...):

* src/en/book/ch09-reference.xml: Fix svn mergeinfo docs.

One more thing in Chapter 9, thanks to Karl Heinz Marbaise
(khmarbaise@...):

* src/en/book/ch09-reference.xml: Tweak svn log docs.

Sort more options lists.

One more thing in Chapter 9, thanks to Karl Heinz Marbaise
(khmarbaise@...):

* src/en/book/ch09-reference.xml: Tweak svn copy docs.

* src/en/book/ch09-reference.xml
Track rename of --keep-changelist to --keep-changelists.

* book/ch03-advanced-topics.xml,
* book/ch02-basic-usage.xml
Note some further constraints on property names.

One more thing in Chapter 9, thanks to Karl Heinz Marbaise
(khmarbaise@...):

* src/en/book/ch09-reference.xml: Fix wording in pre-revprop hook
section.

One small thing in Chapter 8, thanks to Karl Heinz Marbaise
(khmarbaise@...):

* src/en/book/ch08-embedding-svn.xml: s/non-zero/nonzero.