Pkgcore

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- fix docutils-0.5 incompatibility in build_api_docs.py

- python issue 4230 makes __getattr__ support descriptor protocol.
This unfortunately causes part of config handling to go boom- fixed.

Unfortunately this also means that we need to support both descriptor
and *non* descriptor interpretters at *runtime*- if python is upgraded
underfoot, things get unhappy to keep atom.__getattr__ from blowing up.
Fixed either way.

- copy HOMEPAGE into vdb/binpkg by default.


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- profile awareness of eapi files, *including* strict validation.

- tighter use dep and atom support in pkgcore for specified eapis.

- ticket 187; fix a traceback when a specific subset of cycles are
encountered.

- correct a python 2.6 incompatibility; object.__init__() is now strict
about taking no keywords.


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- bug fix for transitive use atoms; if || ( a/b[x?] ), DepSet wasn't detecting
that there were conditionals w/in it, as such wasn't doing evaluation.


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- security fix; force cwd to something controlled for ebuild env. This
blocks an attack detailed in glsa 200810-02; namely that an ebuild invoking
python -c (which looks in cwd for modules to load) allows for an attacker
to slip something in.


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- fix EAPI2 issues: default related primarily, invoke src_prepare for
>=EAPI2 instead of >EAPI2.


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- fix in setup.py to install eapi/* files.
die distutils, die.

- api for depset inspection for tristate (pcheck visibility mode) is fixed
to not tell the consumer to lovingly 'die in a fire'.

- correct a failure in EAPI=2 src_uri parsing complaining about
missing checksums for nonexistent files


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