ENH: Faster numpy array creation in codegen (#686)
ENH: Faster numpy array creation in codegen (#686)

* faster rcm

* update norms

* Remove rcm bucky test

the use of int_argsort makes the exact perm array platform dependent.

* Faster numpy array creation in codegen

qutip/qutip,cgranade/qutip,qutip/qutip,cgranade/qutip