CYKLO-989: don't attempt to display error pages from server's primary
site when /x/ is not defined
CYKLO-989: housekeeping
CYKLO-989: allow overriding skin element loaded to handle the error
CYKLO-989: don't interfere with view enclosure when template is not
overridden
CYKLO-989: Login view, reusing AccessDenied template defined in the site
skin.
CYKLO-990: methods for sorting resource lists and arrays using arbitrary
attributes (numeric, String and Date attribute classes are supported)