To do: in-place API

[cjdoris]

Make in-place versions of all the API functions, like:

pyimport!(ans, "sys")
pyadd!(ans, x, y)
pygetattr!(ans, x, "foo")

These replace the pointer in ans::Py with the result of the computation, instead of allocating a new Py each time. This will allow writing super-fast non-allocating code where needed.

You'd use these by pre-allocating places to store the results with pynew, which can optionally by freed with pydel!.

[cjdoris]

The Python in-place operators would be like:

pyiadd!(ans, x)   # like ans += x

[cjdoris]

These should generally return ans, to make chaining more convenient.

[cjdoris]

A function

pyhasnext!(ans, iterator)

would be useful to return true if there is a next item, and if so set ans to its value.

[cjdoris]

Even for complicated functions (such as pycall!) we can put all the temporary state we need into ans (e.g. by setting it to a tuple of all the things we need). We'd need to generalise the first argument ans to be anything with getptr and setptr! methods, and have a non-allocating PyTupleRef type which stores a pointer to a tuple and an index.

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