abstract response API a litte more complete.

to deal with multiple propstat elements, though the spec seems to say
that they allowed.

objects to prevent acquiring it.

__name__ if there *is* a "." in the name.  (Products passed in
directly don't have one, f'rinstance.)

content types.

per [WebDAV 5.2].

making mgmt interfaces inaccessible to anyone w/o the Manager role.

were accessed and no default object (index_html) existed.

included an entry in the module docstring for it).

Added an entry in the module docstring describing what i *guess* is
the criterion for identifying header elements.  (I'm going to have to
delve into and understand the framework a bit better before *knowing*
this is the case.)