Make org-babel-next-src-block respect ARCHIVE tag

[Cheong Yiu Fung]

Hi, 

When navigating using `org-babel-next-src-block`(C-c C-v C-n), if the next 
source block is in an archived subtree, Org mode would expand it and move 
cursor to it. 

Is this an expected behavior / desired feature? It seems more natural to skip 
source blocks that are under an archived subtree. 

* Heading
#+BEGIN_SRC R
message("Press C-c C-v C-n here")
#+END_SRC
* Heading                                                           :ARCHIVE:
#+BEGIN_SRC R
message("cursor moved to this block")
#+END_SRC
* Heading
#+BEGIN_SRC R
message("or should it jump to here instead?")
#+END_SRC

--
Yiufung