nc::stack, hstack, vstack operates on std::initialier_list<> only.

[TorokLev]

Describe the bug A clear and concise description of what the bug is.

Due to its definition it is impossible to stack dynamically anything. So it makes it completely useless

To Reproduce

include

std::list<nc::NdArray> ll; ll.push_back({10,2,3,4}); nc::hstack(ll); // fails here

Expected behavior A clear and concise description of what you expected to happen.

not failing.

[dpilger26]

Implemented as part of release version 2.11.0.