Blender Git Loki

Fix T40108: Copying materials leaves a shared Action datablock in nested
bNodeTree blocks.

This was broken by rB6e99fb0 (own commit). I expected the `do_action`
argument to be of no importance in this case due to node trees using
material animation, but this is not the case.

Anyway, this patch adds back a do_action to the BKE_libblock_copy_nolib
function as well to restore the previous behavior.