added template for making views (#377)

Cleaned up the helper functions by: 
- Added template for make_view (and new make_const_view) instead of the
copy paste implementation
- checks c_style and dimensions inside make_view
- test binding to be able to probe the checks in make_view

Call sites can be reviewed in a second PR since usage of const or
strictness of conversion depends...

python/src/bind_ClusterVector.hpp

@@ -48,9 +48,6 @@ void define_ClusterVector(py::module &m, const std::string &typestr) {
             "__call__",
             [](ClusterVector<ClusterType> &self,
                py::array_t<bool, py::array::c_style> mask) {
-                if (mask.ndim() != 1) {
-                    throw py::value_error("Mask must be one-dimensional");
-                }
                 return self(make_view_1d(mask));
             },
             py::arg("mask").noconvert(), R"doc(