* flower/include/std-vector.hh

* flower/include/std-vector.hh
* flower/include/array.hh (reverse, swap): Detach from class.
Update users.

* flower/include/std-vector.hh
* flower/include/array.hh (concat): Globally change to insert ().

* flower/include/std-vector.hh
* flower/include/parray.hh
* flower/include/array.hh (elem, elem_ref): Globally replace by
at ().