Specs cleanup: Rename & simplify |varyAll|
Specs cleanup: Rename & simplify |varyAll|

Rename |varyAll| to |varyOptimizationOptions|, because that's what the
function does. Simplify as we don't need a fully generic solution.

jlturner/pegjs,mcanthony/pegjs,mcanthony/pegjs,Sciumo/pegjs,luisvt/pegjs,jlturner/pegjs,pegjs/pegjs,Sciumo/pegjs,Mingun/pegjs,GerHobbelt/pegjs,luisvt/pegjs,GerHobbelt/pegjs,pegjs/pegjs,Mingun/pegjs