Merge branch 'launchpad-1437480'
Pull in topic branch for fixing launchpad-1437480. Involved substantial re-examination and refactoring of the configuration file functions in UIOP. * launchpad-1437480: Provide more doc for MORE arguments in pathname functions. Fix funcall in IN-USER-CONFIGURATION-DIRECTORY Update some comments, docstrings, and a test. Documentation changes and one function renaming. configuration: Adopt XDG wholesale, even on Windows. Rename functions accordingly. Comment tweak. Use os-cond in more places. Remove FIXME: asdf-pathname-test doesn't use its own package anymore. Revised docstrings. Add new pathnames. config-search-pathnames fix and edited docstrings. Fix XDG support and make Windows happier