[PATCH 2/3] salad: do not touch struct heap_node.pos in user's code

[Vladimir Davydov]

On Fri, Feb 22, 2019 at 02:38:59PM +0300, Vladislav Shpilevoy wrote:
> The only goal of reading and writing heap_node.pos was checking
> if a node is now in a heap, or not. This commit encapsulates this
> logic into a couple of functions.

Awesome, thanks. Pushed to 2.1.

(You forgot to push the branch to GitHub so applied the patch from this email).