* Added failing tests for #7155
* Pass getVariable options through to the widget method. Fixes#7155
* Whitespace fix
* Added tests to verify macro parameters work inside filter, reduce, and sortsub operators
* Make currentTiddler variable consistent in subfilters and filter run prefixes
* Updated filterun prefix and subfilter operators to use ..currentTiddler instead of outerCurrentTiddler
Fixes#5246. Now the reduce operator and :reduce filter run prefix will
both return empty output when their input is empty, so that both can be
chained together with the else operator or :else prefix.
