[BUG] Coverage and bug fixes for utils

[TonyBagnall]

got a bit bigger than I expected, so will put up as draft and note changes

Fixes #2135: changes parameter name Fixes #2134; requires weights passed as ndarray Removes unused broken weighting functions Adds tests for show_versions Adds tests for sklearn functions Makes files private with init imports: this is our general package wide policy (I think) and should be adopted where possible imo. Sub directories for utils can be changed in time

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[baraline]

Changes look good, but I would just like some words about the change of approach for the import of the utils module. Do we now want to have most files as private and imported direclty from utils instead of their respective files ? (E.g utils.numba... for the numba utils etc...).

[TonyBagnall]

Changes look good, but I would just like some words about the change of approach for the import of the utils module. Do we now want to have most files as private and imported direclty from utils instead of their respective files ? (E.g utils.numba... for the numba utils etc...).

I think our package wide policy is to have imports via directory init, and this is just imposing that structure. e.g. I change it when I am doing related work in a directory, and hopefully over time this will be adopted, and its better to do it now before version 1.0 to avoid deprecation :)