browserDefault implementations that were returning object_thats_not_self, ()
didnt' work.

towards OFS.Traversable and OFS.Application. Name them so.

Introduce a more generic implementation that's very very close to the Zope 3
one and works on objects that don't inherit from OFS.Traversable or support
acquisition (e.g. views, resources, etc.)

of the loop here.

parent (by using the aq_inner() and aq_parent() functions, not the attributes).

Use new module level aq_inContextOf method, so this works for non-wrappers as well. Still needs to be made aware of __parent__ pointers

module-level aq_acquire, aq_inner, aq_parent, etc. functions.

function so that we can write a module-level function for that functionality
as well.