Add test for bug #522652 with slot-operator

This test case uses || ( bar foo:= ) syntax that is forbidden by PMS.
_solve_..slot_conflicts: fix bug #510270

This fixes an IndexError in _solve_non_slot_operator_slot_conflicts
which occurs when none of the conflict packages matched a particular
atom. This typically means that autounmask broke a USE-dep, but it could
also be due to the slot not matching due to multislot (bug #220341).
Either way, don't try to solve this conflict. Instead, force all of the
associated conflict nodes into the graph so that they are protected from
removal by the conflict solver.

X-Gentoo-Bug: 510270
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=510270
runtests.sh: Update pypy target
setup.py: Update version for the release
Update NEWS and RELEASE-NOTES
emaint: Assign all module __init__.py's __doc__ to a variable intsead

Due to distutils-r1 eclass optimization level, __doc__ strings are removed, breaking the
plugin system's use of __doc__ for it's module description(s).
This causes tracebacks when trying to run emaint.

brian@big_daddy $ emaint -h
Traceback (most recent call last):
  File "/usr/lib/python-exec/python2.7/emaint", line 36, in <module>
    emaint_main(sys.argv[1:])
  File "/usr/lib64/python2.7/site-packages/portage/emaint/main.py", line 161, in emaint_main
    parser = ArgumentParser(usage=usage(module_controller))
  File "/usr/lib64/python2.7/site-packages/portage/emaint/main.py", line 78, in usage
    desc = textwrap.wrap(module_controller.get_description(mod), 65)
  File "/usr/lib64/python2.7/textwrap.py", line 354, in wrap
    return w.wrap(text)
  File "/usr/lib64/python2.7/textwrap.py", line 325, in wrap
    text = self._munge_whitespace(text)
  File "/usr/lib64/python2.7/textwrap.py", line 154, in _munge_whitespace
    text = text.expandtabs()
AttributeError: 'NoneType' object has no attribute 'expandtabs'
brian@big_daddy $

Problem found by: Zac Medico <zmedica@gentoo.org>