Raise error at slice ndarray interface

> Hum, I almost add tests and then I wonder : What do we want to test? That an

We want to test that the code you add to the database does what it
should dot :-)
> error is raised when we use sliced array as input? So if we have a correct
> Python behavior handling slice, it will be a failing test?

It will probalbly be removed, as the tested code will also disapear :-)

> BTW. test_ndarray_bad_dimension should be in test_conversion.py no?

yes