Improve handling of inline annotations without conflicts

[lagru]

Uses _section_annotations to avoid duplicating code paths and logic, and makes sure that no note or warning is raised for inline annotations if there is no conflict with a doctype. Also improves the test suite around this.

Make sure that no warning is raised for inline annotations, if there is no
conflicting annotation in a docstring. Otherwise, the inlined annotation 
takes precedence and a warning is printed.
{label="fix"}