Removing paths as links to avoid confusion and simplify code. Unit wildcard now works. Handling specific path units much better by imploding arg().

Using strings for PDS properties instead of integers. Added table index on namespace. Namespaced _pds_items_key_load(). Finished internal reindex. Added descriptions to PDS add form.

Initial commit of PDS module. PDS is a generic tool for storing and retrieving key-value data based on Drupal paths.