Support documentation of multiple modules in a single website. Use
--modules or the config-file modules for more control. See the
README 'Documenting multiple modules' for more details. Argjira MalaPedro AlcobiaJohn Fairhurst#564
Improve page breadcrumbs to include parent pages and indicate source module
of extensions from other modules. John Fairhurst
Add --readme-title and --docset-title to set the titles of the readme
docs page and the Dash docset independently of the module name. John Fairhurst
