DocBuilder exception fixed (when open generic type is used)
Merge remote-tracking branch 'WildOgr/doc' into ipy-2.7-maint
Fix CP #33312 - Sockets are not properly closed
Fix #33362 - Discrepancy in dict __delitem__

Added a RemoveDirect function so that pop() can directly remove the key
w/o calling __delitem__ on a derived class.
Fixed #33073 - Make PythonHiddenAttribute public.