Takes 3 arguments: field (can also be a tiddler attribute),value,sortField (optional)
Returns all tiddlers that match the given field and value. If sortField is given the resulting tiddlers are sorted.
See the similiar TiddlyWiki.prototype.getTaggedTiddlers
Returns all tiddlers that match the given field and value. If sortField is given the resulting tiddlers are sorted.
See the similiar TiddlyWiki.prototype.getTaggedTiddlers