* doc/org-manual.org, etc/ORG_NEWS: Document :target option
for the TOC keyword.
* lisp/ox.el (org-export-resolve-link): New function.
* lisp/ox-ascii.el (org-ascii-keyword): Added :target to the TOC
keyword.
(org-ascii--build-toc): Changed LOCAL argument to SCOPE.
* lisp/ox-html.el (org-html-keyword): Added :target to the TOC keyword.
* lisp/ox-md.el (org-md-keyword): Added :target to the TOC keyword.
(org-md--build-toc): Changed LOCAL argument to SCOPE.
* lisp/ox-odt.el (org-odt-keyword): Added :target to the TOC keyword.
* testing/lisp/test-ox.el (test-org-export/collect-headlines): Added
tests for specifying scope by CUSTOM_ID or by fuzzy matching.
(test-org-export/resolve-link): New test.
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