Version Control With Subversion Source

Fix grammar typo in book.

Patch provided by Andreas J Koenig <andreas.koenig.gmwojprw@...>.
Thanks, Andreas!

Book Spanish. Translated two paragraphs.

Book Spanish. Added two terms more to glossary.

Book Spanish. Corrected subcommand omission in instructions.

Norwegian svnbook: Translated section 2 and 3 of chapter four and fixed
some typos and errors in ch00.xml and ch03.xml .

* doc/translations/norwegian_nb/TRANSLATION-STATUS
ch04.xml raised to 51%.

* doc/translations/norwegian_nb/book/ch00.xml
Fixed some broken <xref linkend> elements mangled by the previous
version of the dings_it script.

* doc/translations/norwegian_nb/book/ch03.xml
Typo fixes and some rewrites.

* doc/translations/norwegian_nb/book/ch04.xml
Section 2 and 3 translated.

Norwegian svnbook: Change location of the dings_it script in the Vim
syntax file.

* doc/translations/norwegian_nb/tools/svnbook.vim
Change mapping of F5 to use ~/bin/dings_it instead of ~/svnbook_nb .

Norwegian svnbook: Fix regexp in the dings_it script.

* doc/translations/norwegian_nb/bin/dings_it
Fix regexp to not remove first non-whitespace character when removing
linebreaks inside element.

Book Spanish. Added rule about log messages.

* notes/ssh-tricks: Add a discussion of the sshd authorized_keys "command"
directive and how to use it for various svn+ssh setups.
* doc/book/TODO: Refer to the ssh-tricks file for details on setting up
svn+ssh with only one Unix account.

Book Spanish. One task done, added a new one, updated others.