* Started to write transformation to fuse Interpolate sequence.
* Some changes.
* Written the transformation to fuse two Interpolate layers.
* Deleted commented code.
* Small fixes.
* Some fixes.
* Started to write tests.
* Small fix.
* Added more tests. Deleted commented code.
* Deleted redundant headers.
* Small fix.
* Fixes in the function can_be_fused(): the last statement was decomposed.
* Added operators == and != for op::v4::Interpolate::InterpolateAttrs.
* Added more checks for nullptr.
* Fixed codestyle.
* Added Interpolate registration.
* Small change.
* Implementation of operator== of InterpolateAttrs was moved into header file.
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