* contrib/lisp/org-element.el (org-element--element-block-re): New
variable.
(org-element-current-element): New function.
(org-element-parse-elements): Make use of the new specialized function
instead of `org-element-at-point'. Also narrow buffer to current
container (greater element or recursive object) being parsed to
improve search speed.
(org-element-comment-parser): Speed-up parsing for comments at column 0.
(org-element-guess-type): Make comment regexp less restrictive, due to
comment optimizations.
* contrib/lisp/org-element.el (org-element-parse-objects): Untabify
strings between objects to avoid any `tab-width' mismatch.
* contrib/lisp/org-element.el (org-element-normalize-contents): No
longer need to handle tabs.
* contrib/lisp/org-element.el (org-element-map): Remove use of
`org-export-update-info'.
* contrib/lisp/org-export.el (org-export-persistent-properties,
org-export-persistent-properties-list): Remove variables
(org-export-collect-tree-properties): Rename from
`org-export-initialize-persistent-properties'.
(org-export-data): Get rid of `org-export-update-info' calls.
(org-export-as): Use new `org-export-collect-tree-properties' name.
(org-export-resolve-coderef, org-export-get-loc): New functions.
(org-export-handle-code): Use new functions instead of removed
properties. Reformat code. Change signature.
* contrib/lisp/org-element.el (org-element-section-parser,
org-element-section-interpreter): New functions
(org-element-greater-elements): Add new element to the list.
(org-element-at-point): Change arguments to handle a new section mode.
(org-element-guess-type): Accept an optional argument to look for
sections in priority.
(org-element-parse-buffer): Start in section mode by default. Thus
any text before the first headline is still in a section of his
own.
(org-element-parse-elements): Handle new section mode.
* contrib/lisp/org-element.el (org-element-headline-parser): Update
list of attributes in the docstring.
(org-element-inlinetask-parser): Complete attributes with properties
inherited from any property drawer within the inlinetask and with
time properties (i.e. scheduled, clock...).
* contrib/lisp/org-element.el (org-element-map): Change name of local
variables to prevent variable name collisions with the function
around org-element-map.
