Dev/rosenblatttransform (#241)

- added rosenblatttransform 
- added 3x3 eta methods 
- interpolation can be used with various eta functions
- added documentation for interpolation, eta calculation 
- exposed full eta struct in python 
- disable ClusterFinder for 2x2 clusters 
- factory function for ClusterVector

---------

Co-authored-by: Dhanya Thattil <dhanya.thattil@psi.ch>
Co-authored-by: Erik Fröjdh <erik.frojdh@psi.ch>

python/src/bind_ClusterFile.hpp

@@ -81,23 +81,4 @@ void define_ClusterFile(py::module &m, const std::string &typestr) {
         });
 }
 
-template <typename Type, uint8_t CoordSizeX, uint8_t CoordSizeY,
-          typename CoordType = uint16_t>
-void register_calculate_eta(py::module &m) {
-    using ClusterType = Cluster<Type, CoordSizeX, CoordSizeY, CoordType>;
-
-    m.def("calculate_eta2",
-          [](const aare::ClusterVector<ClusterType> &clusters) {
-              auto eta2 = new NDArray<double, 2>(calculate_eta2(clusters));
-              return return_image_data(eta2);
-          });
-
-    m.def("calculate_eta2", [](const aare::Cluster<Type, CoordSizeX, CoordSizeY,
-                                                   CoordType> &cluster) {
-        auto eta2 = calculate_eta2(cluster);
-        // TODO return proper eta class
-        return py::make_tuple(eta2.x, eta2.y, eta2.sum);
-    });
-}
-
 #pragma GCC diagnostic pop