Make use of __binary_op for two tensor binary high-level functions

[Markus-Goetz]

Related
Might require issue #167 to be implemented first and potentially #377.

Feature functionality
Make use of the __binary_op for higher-level broadcastable binary operations, such as minimum(), where(), outer(), ... The logic for resplitting DNDarrays should already be present in __binary_op (or should eventually be there). It would be redundant and redundant to have them yet again in each of these high-level calls.

Individual calls might make it necessary to copy some parts of the behaviour. If so, think about how to split up __binary_op so that the code duplication is minimal.

[ClaudiaComito]

This issue has been partially addressed (#662).

Breaking up __binary_op() in two (separating __binary_checks() ?) would indeed be helpful for many operations, so I'm leaving this issue open.

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Reviewed within #1109

[ClaudiaComito]

Adding logical.isclose #458 , logical.allclose to this list