[O] code blocks: update cache hash on export

[Ulrich J. Herter]

Hi everybody!

Two questions I'd like to ask the Org-community: 

First:
When I export my document, the source blocks with outdated cache hashes
     run, but no new hashes are put in the document.

I would like to have the hashes updated when the run on export, so next
time I export the don't need to be evaluated. This would save a lot
quite some time!

Is there a switch I missed, or any way to get this behaviour?


Second:
Is there a function to get the hash of a #+CALL:-block? C-c C-v a ()
doesn't work there.


Thanks a lot,
Ulrich