make world satisfaction not monotone nor anto-monotone wrt. the resource. that's not a property we want to use anywhere.

define operations as plain coq functions rather than non-expansive functions. this signficiantly improves the behavior of 'simpl morph'

refine filling axioms; add ectx_lang: a language defined in terms of evaluation contexts; show that it can do filling

remove commented-out axioms; fix weakest-pre and also change it to no longer contain the final view shift; re-establish adequacy