.T and .mT objects

[ohrechykha]

[ohrechykha]

I've had to add clones of matrix_transpose from linear algebra and its helper function is_sorted_descending_all_levels inside array object file so that .T and .mT properties do not reference outside functions. But there must be other ways of not getting caught by Pylint. Also, it seems like there is no need to do from . import _spec_array_object and reference _spec_array_object.array instead of array inside the _helper_functions file, but when trying from _spec_array_object import array it I get [import-not-found].