[Bug] org-store-link should not insert a document level ID property

[Matt Lundin]

The introduction of document-level property drawers (commit
1bdff9f73dc1e7ff625a90e3e61350bdea99f29c from May 2019) introduced
inconsistencies in the behavior of org-id and org-store-link.

If org-id-link-to-org-use-id is set to t or 'create-if-interactive,
calling org-store-link above the first headline in an org file will
insert a PROPERTY drawer and an ID at top of the file, so that the file
(call it "~/test.org") looks like this:

--8<---------------cut here---------------start------------->8---
:PROPERTIES:
:ID:       1f43e860-9e7b-4c8f-82b9-6ed3352e589f
:END:

* First headline
--8<---------------cut here---------------end--------------->8---

However, the link that Org actually stores is "[[file:~/test.org]]", so
the ID is irrelevant.

In addition, a link to a document-level ID does not work. Following
"[[id:1f43e860-9e7b-4c8f-82b9-6ed3352e589f]]" results in this error:

user-error: Before first headline at position 14 in buffer test.org

So either: 

1. org-id and org-store-link/org-open-link should support document level
   ids in a user-configurable way, or
2. org-id-get-create should detect whether it is above the first heading
   and should not create an id

Option #2 would obviously be the easier fix.

Gustav: were IDs within the scope of your initial thinking about
document level properties? Or are these largely irrelevant?

Best,
Matt