Introduce restructuredText man pages to sync the online and source code man page documentation.
The templated man pages (*.in) are still part of the repo but generated with docutils from their .rst counterpart.
Documentation on how to generate those (mainly for core developers) are in README.man.
Previously reported build options like linked libs and linked modules
are now moved from `-h` to `-V` as well for consistency.
- PACKAGE_BUGREPORT now also includes link to GitHub issues.