correctly

EvalException is enabled and RegistryManager and or EvalException detect an
unexpected exception, they'll call StackedObjectRestorer to:
o save the Registry state
o change currently registered StackedObjectProxies to detect when they're being
used within the interactive debugger via a threadlocal (resulting in a small
performance hit). They'll get their proxied object from the restorer when they
detect the presence of the debugger, otherwise they'll continue to work as
normal

differs from the regular (includes hidden frames)

o fixed the misleading ResponseHeaderDict deprecation warning

 - now returns a multidict instead of dict (like parse_dict_querystring)
 - removed all_as_list keyword arg: use multidict.mixed() instead to
 produce an all_as_list dict
 - preventing FieldStorage from parsing out QUERY_STRING during GET/HEAD
 requests
 - the fake_out_cgi check wasn't careful enough about multipart/form-data
 content-types. Was also missing a StringIO import (r5471 broke file uploads)
o evalexception's wsgiapp decorator assumed parse_formvars would return
GET vars during a GET (buggy behavior), now it explicitly asks for them