autosync catalogs
- Add a "created" index to the system catalog and an associated index view
  (which scrapes the ``__created__`` attribute of the resource or uses a
  default EARLIEST_DATE if no such attribute exists).  Add an evolution script
  to add this index to the system catalog and reindex existing content.

- Updated ISDIAPI with get_macros API.

- Made the default_columns in the folder contents view include the created date
  (also sortable, like name, using the created index).

- Add an html formatter to the slickgrid configuration.

- Make the name column in the default sdi columns use the new html formatter
  instead of the icon_label_url formatter.

- The folder_contents view no longer returns the keys "url" or "icon" in the
  resultset.  Constructing the name column value is now done exclusively in the
  default column handler.

- Structure-ified slickgrid wrapper options in contents.pt because wrapper
  options can now contain html.