Add new VSS troubleshooting instruction to Windows chapter.

- add missing section pointer to debugging, making ref possible.
- add information about VSS `the shadow copy storage could not grow in time` trouble.
- update indexes to sphinx syntax.
- group troubleshooting backup section under Dealing with windows problems.
- group registry stuff together.
- clean up compatibility section.
- update Microsoft documentation links.

Signed-off-by: Bruno Friedmann <bruno.friedmann@bareos.com>
Co-authored-by: sduehr <stephan.duehr@bareos.com>

docs/manuals/source/Appendix/Debugging.rst

@@ -1,3 +1,5 @@
+.. _section-Debugging:
+
 Debugging
 =========