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Book Spanish. Translated almost the 90% of th chapter

* src/en/book/appa.xml
Make some wording tweaks suggested by Ulrich
Eckhardt <eckhardt@...>, plus a colon-to-emdash
tweak suggested by me with my O'Reilly hat on.

* zh/book/appb.xml: nannan

* zh/book/ch06.xml: edited part

* zh/book/appa.xml: contributed by nannan

Teach run-fop.sh to find the desperation fop based on its own location, not
requiring an argument to tell it where it is.

* tools/bin/run-fop.sh: Locate the DESPERATION_FOP_DIR relative to run-fop.sh's
own location, and update not to take an argument of its own.

* tools/Makefile.base-rules: Don't pass an initial directory argument to
run-fop.sh.

Deprecate some redundant or overly verbose Make target names, whilst
introducing some shorter, more appropriate forms.

* tools/Makefile.base-rules: Fully support target names without a redundant
'book-' prefix/infix.
(fo): New target.
(all-ps, all-pdf): Deprecate useless aliases.

* tools/Makefile.base: Add compatibility targets, temporarily.

* tools/book-dist.py, ru/Makefile: Change to use the non-deprecated forms.

Tweak the book buildsystem so that it is actually designed to be reusable.

* tools/Makefile.base: Send most of the content of this file to the two new
files added in this commit.
* tools/Makefile.base-vars, tools/Makefile.base-rules: New. Tweaked to add the
capability to build books which don't have any image files.

Makefile refactoring.

* tools/Makefile.base:
Strip redundant 'BOOK_' prefix from the name of make variables.
(NAME, OUTNAME, STYLESHEET): New variables.

* nb/Makefile, ru/Makefile: Adjust to changed name of FO_XSLTPROC_OPTS.

* zh/book/ch05.xml: contributed by nannan