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Merge pull request #664 from hippo91/bug_pylint_2721

Deep rework of the numpy brain.

The original brain has been split into numerous one. Each numpy brain module corresponds to
a numpyone. There are:

brain_numpy_core_fromnumeric => numpy.core.fromnumeric
brain_numpy_core_function_base => numpy.core.function_base
brain_numpy_core_multiarray => numpy.core.multiarray
brain_numpy_core_numeric => numpy.core.numeric
brain_core_numerictypes => numpy.core.numerictypes
brain_core_umath => numpy.core.umath
brain_numpy_random_mtrand => numpy.random.mtrand
Last but not least, the numpy.ndarray class has its corresponding astroid's brain (brain_numpy_ndarray).

The major improvement, besides a clearer organisation, is the fact that each method of the ndarray class should now be correctly inferred. Especially those returning ndarray objects.

It has been made possible by ensuring that the return type of those methods is inferred as ndarray and nothing else. To achieve this, the inference_tip function has been used.

When a numpy callable may return two different kinds of objects, for example bool or ndarray, the choice to prefer ndarray has been made in the corresponding astroid brain method.

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