Function `org-link-search' does exact headline search
* lisp/org.el (org-link-search): Change headline search such that it
always does an exact search, ignoring spaces.
* testing/lisp/test-org.el (test-org/fuzzy-links): Test exact headline
match with spaces and cookies.
* doc/org.texi (External links): Cleanup footnote about the
`org-link-search-must-match-exact-headline' option for text searches
and add a footnote about the effect of the same option for heading
searches.
* doc/ORG-NEWS: Document changes.