Merge commit 'origin/master' into xs_attrs

Merge commit 'origin/master' into xs_attrs

* commit 'origin/master': (172 commits)
  Push to origin after tagging
  Don't define new() in this benchmark, make_immutable creates one
  Fix a speling error in Changes
  update Changes
  Document deprecation fixes
  Pass @_ from deprecation wrapper
  warn if we aren't going to inline a constructor because one is already
  pass in args for all deprecated methods
  bump version to 0.81
  Update changes for release
  Changelogging.
  Avoid c compiler warnings by declaring some unused function arguments.
  Include stack traces in the deprecation warnings.
  Make _initialize_body private to match other classes
  Add date for release
  bump version to 0.80_01
  Handle undef without warnings in class_of
  Make the deprecation warning for attributes match all other similar
  Tweak changes to be a bit more useful
  Document all the renames and deprecations in changes
  ...

Conflicts:
	Makefile.PL