docs/manual/advanced-dataaccess.xml: Add section on how to use fakesrc/fakesink/identity in your application, plus se...

Original commit message from CVS:
* docs/manual/advanced-dataaccess.xml:
Add section on how to use fakesrc/fakesink/identity in your
application, plus section on how to embed plugins. Also mention
probes.
* docs/manual/appendix-checklist.xml:
* docs/manual/appendix-debugging.xml:
* docs/manual/appendix-gnome.xml:
* docs/manual/appendix-integration.xml:
Debug -> checklist, GNOME -> integration, add sections on Linux,
KDE integration and add other things useful for application
development.
* docs/manual/manual.xml:
Remove some fixmes, update some file pointers.
* docs/pwg/appendix-checklist.xml:
Fix typo.
* docs/pwg/building-boiler.xml:
Remove ugly header and add commented fixme.
* docs/pwg/pwg.xml:
Add fixme.
* examples/manual/Makefile.am:
Add example for added docs.