Version Control With Subversion Source

* src/en/book/ch02-basic-usage.xml
Fix diff description problem -- it can compare repository revisions,
not compare two different repositories with each other.

Suggested by: Jens M. Felderhoff <j.m.f {at} gmx.li>

* src/en/book/ch06-server-configuration.xml
Clarify which username gets credited for a commit in the
svnserve-over-ssh situation.

Patch by: Vincent Lefevre <vincent {at} vinc17.org>
(Tweaked by me.)

* src/en/book/ch02-basic-usage.xml
Rework some stuff to avoid talking about "checking in", which is
explicitly forbidden in our HACKING document. As a side-effect,
lose a reference to making changes to a file "in a repository",
since those changes are in fact made in the working copy and
explicitly *not* transferred to the repository in this particular
example.

More minor typo tweaks from Øyvind A. Holm <sunny@...>, plus a
reworking of a couple of paragraphs for readability and to avoid an
awkward use of an mid-sentence screen output example.

* src/en/book/ch09-reference.xml

Minor fixes. Patch by Øyvind A. Holm <sunny {at} sunbase.org>.

* src/en/book/appc-webdav.xml
Refer to Adobe as the producer of Dreamweaver instead of Macromedia.

* src/en/book/ch00-preface.xml
CamelCase "ClearCase".

* src/en/book/ch03-advanced-topics.xml,
* src/en/book/ch02-basic-usage.xml
Minor spelling fixes.

* ch02-basic-usage.xml
- tasks #77 to #84 (cf. http://www.svnbook.de/report/6)

* ch02-basic-usage.xml
- tasks #73 to #76 (cf. http://www.svnbook.de/report/6)

* ch02-basic-usage.xml
- some rephrasing

* src/de/book/ch03-advanced-topics.xml
- merged change of English version 3282.

* ch03-advanced-topics.html: sentence should start with capital letter. Really.