Migrate user configuration directory to a new, XDG-based, location.
Do not import test_starter in main tests module to improve robustness of tests imports.
Move handling of default config. values to configuration classes.
Fix alignment to 80 columns in system configuration file.
Update NEWS.
API documentation fixes.
AutoArchive 2.0.6 released
Added tag RELEASE_2.0.6 for changeset 870363ed1429