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Replace InverseOperator and AdjointOperator with OperatorAdapter, and more

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Merged Martin Reinecke requested to merge op_twiddling into NIFTy_4 Apr 02, 2018
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This patch introduces the OperatorAdapter class, which does the work so far done by InverseOperator and AdjointOperator, but it is smaller and more flexible.

It also removes the method inverse_draw_sample() and adds a fromInverse flag to draw_sample() instead, which also makes many things easier to write.

As a completely unrelated bonus, there is an interface to SciPy's conjugate gradient solver, which can now be used as an alternative to Nifty's ConjugateGradient.

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Source branch: op_twiddling