Remove the download links in the  CapabilitiesRowExpander

We don't want to allow users to download layers via the add layers
dialog.
Remove hard coded search button text
Remove the form if the user selects a different server
Remove unused methods in CapabilitiesRowExpander
Call the template in the RowExpander with the json

This commit changes to RowExpander to call the row template with the
json property of the record object. Original the template was called
with the data property but we need info in the json property. I was
also unable to figure out how to append the record.data property
itself.
Added the thumb nails to the add layer dialog