added a PWONone global object that can be used in place of Py_None.  This is useful because gcc doesn't allow Py_None to be passed into functions with a PWOBase& declartion.
added a PWONone global object that can be used in place of Py_None.  This is
useful because gcc doesn't allow Py_None to be passed into functions with a
PWOBase& declartion.


git-svn-id: 77a43f9646713b91fea7788fad5dfbf67e151ece@335 94b884b6-d6fd-0310-90d3-974f1d3f35e1

chadnetzer/numpy-gaurdro,teoliphant/numpy-refactor,illume/numpy3k,teoliphant/numpy-refactor,illume/numpy3k,teoliphant/numpy-refactor,efiring/numpy-work,illume/numpy3k,efiring/numpy-work,jasonmccampbell/numpy-refactor-sprint,Ademan/NumPy-GSoC,jasonmccampbell/numpy-refactor-sprint,Ademan/NumPy-GSoC,jasonmccampbell/numpy-refactor-sprint,jasonmccampbell/numpy-refactor-sprint,chadnetzer/numpy-gaurdro,teoliphant/numpy-refactor,chadnetzer/numpy-gaurdro,efiring/numpy-work,teoliphant/numpy-refactor,Ademan/NumPy-GSoC,efiring/numpy-work,Ademan/NumPy-GSoC,chadnetzer/numpy-gaurdro,illume/numpy3k