Add support for the following attributes in layout.conf to allow more
precise configuration of inheritance of settings from repositories:
  eclass-masters
  package.mask-masters
  use.aliases-masters
  use.force-masters
  use.mask-masters
Enable BytesWarnings.
Rename portage._sync_disabled_warnings to portage._sync_mode.
Deprecate portage.dbapi.porttree.portdbapi.porttree_root and portage.dbapi.porttree.portdbapi.eclassdb.
portage.eclass_cache.cache.__init__(): Deprecate overlays parameter.
(This parameter has been unused in Portage since commit 2bd2620142d15344f32ef67896c4fa88e5386953.)
Added support for variable expansion in source command argument in make.conf
ebuild(5): document the "has" function
ebuild(5): document usev
Use -b instead of -bb.
(-bb can trigger errors, depending on Python version and environment.)
Fix test with Python 2.6.
(assertIsNotNone was introduced in Python 2.7 and 3.1.)
Fix some DeprecationWarnings.
Implement FEATURES="mirror" for emerge (bug 498498)

This was only implemented for the ebuild command before.
Acked by: Mike Frysinger <vapier@gentoo.org>