Changed meta_types definition to use actual class meta-types.

meta-type.

from performing some operations.  This is primarily to prevent
access to management operations on instance methods accessed through
an instance, rather than through a class.

when it is used on a "method".  When used on a method, it manages
the mapping from components permissions to whole (instance) permissions.

is a permission setting whos value is a string giving the name of
an alternate permission.

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.