Radio targets cannot beging or end with whitespace
* lisp/org.el (org-radio-target-regexp): Radio targets cannot begin or
end with whitespace.
(org-target-regexp): Update syntax according to previous rule.
(org-any-target-regexp): Fix fontification bug.
* testing/lisp/test-org-element.el (test-org-element/radio-target-parser):
Add test.
Variables are turned into defconst to emphasize the fact that they are
not subject to change.
Thanks to Daniel Clemente for reporting it.
http://permalink.gmane.org/gmane.emacs.orgmode/84461