Inline some simple parts of the document structure

src/docs/asciidoc/prob_handbook.adoc

src/docs/chapter/user/00_introduction.adoc

src/docs/chapter/user/65_Java_2-0_API/00_section_header.adoc

src/docs/chapter/user/65_Java_2-0_API/ZZ_section_footer.adoc

src/docs/chapter/user/ZZ_Appendix/00_section_header.adoc

src/docs/chapter/user/ZZ_Appendix/A_literature.adoc

src/docs/chapter/user/ZZ_Appendix/ZZ_section_footer.adoc