Documented the new 'collapsible' argument of the section definition array.
Cleaned redundant lines.
- Update the headline descriptions.
- Added a change log item.
- Added a date the the latest change log item.
- Updated the tested-up-to version.
Fixed a mark-up in the inline documentation.
Updated inline documentation.
Advanced the version number to 3.4.0 for a release.
Generated documentation from the source code.