debug: Add support for more attributes for the debug info. * `debug_render_not_empty`: don't render an "empty" label if not attributes or items have been rendered for an object. * `debug_render_doc_dynamic`: render dynamic doc-string.

[pytest]
norecursedirs = .* _darcs CVS .svn .git .hg *.egg-info dist build node_modules venv tmp* {args}