ob-core: Fix wrong indentation of results

* lisp/ob-core.el (org-babel-get-src-block-info): Look for indentation
  value at the correct location.
* testing/lisp/test-ob.el: Add test.
Fix filling with `adaptive-fill-regexp'

* lisp/org.el (org-adaptive-fill-function): Look for a fill prefix at
  the beginning of the paragraph and subsquently on its second line
  instead of the current line.
* testing/lisp/test-org.el: Add test
Merge branch 'maint'
ox-org: Fix arguments mismatch in `org-export-as-org'

* lisp/ox-org.el (org-export-as-org): Add missing BODY-ONLY argument,
which is always nil in this back-end.

Reported-by: Nicolas Girard <girard.nicolas@gmail.com>