* contrib/lisp/org-element.el (org-element-headline-parser,
org-element-inlinetask-parser, org-element-item-parser,
org-element-verse-block-parser, org-element-current-element): New
optional argument so parsing of secondary string is not mandatory.
(org-element-parse-elements): Remove duplicate part from doc-string.
(org-element-at-point): Improve speed of function since secondary
string are never parsed.
(org-element-secondary-value-alist): Simplify doc-string.
* testing/lisp/test-org-element.el: Add test.