[PATCH 1 of 7 bm-refactor V2] bookmarks: factor out delete logic from commands

[Martin von Zweigbergk]

On Wed, Jun 21, 2017 at 1:45 PM, Sean Farley <sean at farley.io> wrote:
> # HG changeset patch
> # User Sean Farley <sean at farley.io>
> # Date 1497333768 25200
> #      Mon Jun 12 23:02:48 2017 -0700
> # Branch bm-refactor
> # Node ID afad435bfa048b562cd4e302f01d0456e7ad33c5
> # Parent  41b081ac2145d88ba1fe494630ce69652f016078
> bookmarks: factor out delete logic from commands
>
> While we're here, let's use fancy context managers. I believe this
> should still work since our locks are re-entrant.

Dropping the last sentence in flight.