Portals; Options page; "Read Me" button now displayed below Data Adaptor Script field

A special "README" Resource can be created for Portals.

This is designed to allow any documentation required for the Portal's Data Adaptor Script to be defined.

If this Resource exists, a "Read Me" button is now displayed below the "Data Adaptor" field on the Options page of the Portals form.

NOTE: The "README" Resource should be a full HTML Document.