allow a summary field to be used for meta description
allow a summary field to be used for meta description

note - it would be good if this doesn't exist to try and take the first
paragraph of the tiddler text if it is a non-typed tiddler. Thoughts
@cdent ?

FND/tiddlyspace,FND/tiddlyspace,FND/tiddlyspace,TiddlySpace/tiddlyspace,TiddlySpace/tiddlyspace,TiddlySpace/tiddlyspace