Rearrange handbook files and merge developer handbook and user manual

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

src/docs/chapter/user/ZZ_Appendix/01_Team.adoc

src/docs/chapter/user/ZZ_Appendix/02_FAQ.adoc

src/docs/chapter/user/ZZ_Appendix/03_Download.adoc

...cs/chapter/user/ZZ_Appendix/04_DownloadPriorVersions.adoc

src/docs/chapter/user/ZZ_Appendix/05_Links.adoc

...ocs/chapter/user/ZZ_Appendix/06_ProB_Release_History.adoc

src/docs/chapter/user/ZZ_Appendix/10_Bugs.adoc

src/docs/chapter/user/ZZ_Appendix/11_Troubleshooting.adoc

src/docs/chapter/user/ZZ_Appendix/20_ProBLicence.adoc

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

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

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