adding an INPLACE_ARRAY typemap without dimensions

See [this discussion][1] (and what I am doing with it [here][2]) as to why I found this useful. Let me know what you think. I could a similar typemap for the other ARRAY1 types and update the docs if you think others could find this useful too. Maybe they should be called I*_ARRAY rather than *_ARRAY1 as it's just a pointer essentially and could work for any dimension arrays.

[1]:http://mail.scipy.org/pipermail/numpy-discussion/2013-November/068330.html
[2]:http://dev.drobilla.net/attachment/ticket/940/test_numpy.py