-Bugfix: null WorkspaceName value caused problems. Also "?" was appended
to GET requests even with no query string.

-Added a repository definition for Columbia. Supporting icon and css.

-Added browse graphic to FGDC style sheet, when it exists.

-Bugfix: improperly referenced object in getPreviewMethod (for default
value)

-Added basic support for Data Types "Tabular" and "Document". Supporting
icons and css.

-Bugfix: externalLink links were not rendered properly in layerTable
objects.