Lazyarray

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* When deepcopying, VectorizedIterable objects as base_value are no longer copied, rather we keep a reference to the original.

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* Fixed a bug with callable lazyarrays.

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* Fixed a bug where the base value was homogeneous but one or more operations involved inhomogeneous arrays.

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* Fixed bugs related to indexing multiple axes at the same time (`3`_, `4`_)

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* Support `numpy.int64` as indices.
* Better support for boolean indices.
* Handle the case of constant `larray`s of size 1.

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* Fixed behaviour of larray(VectorizedIterable) to match that of numpy array when indexing a single item.
* Pulled out `partial_shape()` and `full_address()` methods of `larray` as standalone functions.
* Better support for lists as masks.
* `larray`s are now callable, provided their `base_value` is callable and the argument is another `larray`.