Version Control With Subversion Source

* src/en/book/ch03-advanced-topics.xml
Add id="" to variable list containing the svn:externals URL magic syntax.

Patch by: Neels J Hofmeyr <neels{_AT_}elego.de>

* src/en/book/ch05-repository-admin.xml
(fsfs-reshard.py):
Remove repetition "used used".
(Packing FSFS filesystems):
Keep only "filesystem" in "operating system filesystem",
also avoid one repeated use of word "penalty".

Patch by: Neels J Hofmeyr <neels{_AT_}elego.de>

Follow-up r3476, ISO XML entity tricks for translation, simply is better

Thanks, Nicolas François <nicolas DOT francois AT centraliens DOT net> !

Update Chinese translation(2068 tr, 1236 fu, 334 un)

ISO XML entity tricks for translation

Because svnbook source xml use external entity instead of xinclude,
so after xinclude process, the external entity will be expanded. currently,
po4a can't treat those strings as equivalent, therefore we must translate
every source xml separately.

Update Chinese translation(2041 tr, 1263 fu, 334 un)

* zh/po/svnbook.po: 2041 tr, 1263 fu, 334 un.
* index.zh.html: Respect 'NON-ENGLISH TRANSLATION-SPECIFIC STUFF'

Update Chinese translation (index.zh.html)

* trunk/src/de/book/ch07-customizing-svn.xml
- Fixes ticket #234 (cf. http://www.svnbook.de/report/6).

* trunk/src/de/book/ch07-customizing-svn.xml
- Fixes ticket #233 (cf. http://www.svnbook.de/report/6).

Update Chinese translation(2029 tr, 1275 fu, 334 un)

* tools/build-nightlies: zh no 'book' directory.
* tools/Makefile.base-po: Typo fix.
* zh/po/svnbook.po: Update Chinese translation
* zh/stylesheets: Set section.autolabel=1