Fix `org-insert-heading' before first headline

* lisp/org.el (org-insert-heading): Fix error when inserting
  a headline before first headline, with point not at bol.  Remove
  source block check for consistency with behavior after first
  headline.  Tiny fix to docstring.

* testing/lisp/test-org.el (test-org/meta-return): Remove unnecessary
  test (not testing specifications).
(test-org/insert-heading): New test.
org.el (org-overview): Don't call `recenter'

* org.el (org-overview): Don't call `recenter'.

Thanks to Nicolas Richard for suggesting this.
org.el (org-insert-heading): Be more consistent in respecting content

* org.el (org-insert-heading): With one universal prefix
argument or `org-insert-heading-respect-content' set to `t',
always respect the content, i.e. don't insert a list item and
don't convert normal lines into headings.  Update docstring.
(org-insert-heading-respect-content): Remove unused arg.
(org-insert-todo-heading-respect-content): Don't use
`org-insert-todo-heading-respect-content', use the second
argument of `org-insert-todo-heading' instead.

* org-mobile.el (org-mobile-edit): Use only one arg.

Thanks to Bernt Hansen for reporting this.
Prefer `set-window-start' over `recenter' in some places.

* org-agenda.el (org-agenda-show-1):
* org-table.el (org-table-show-reference):
* org.el (org-fix-ellipsis-at-bol)
(org-first-headline-recenter): Use `set-window-start' instead
of `recenter'.

* org-agenda.el (org-recenter-heading): Delete.
org-agenda.el: Fix bug when redoing sticky agendas with log mode and/or clockreport mode on

* org-agenda.el (org-agenda-mode): Let `org-agenda-redo' DTRT
when agenda are sticky.
(org-agenda-tag-filter-while-redo): Delete.
(org-agenda-list, org-agenda-redo, org-agenda-filter-by-tag):
Remove unused code.
(org-agenda-clockreport-mode, org-agenda-set-mode-name): Don't
consider tag filters.

Thanks to Bernt Hansen for reporting this.
Fix 30220ff
fix semi-backend bug in org-mime

* contrib/lisp/org-mime.el (org-mime-multipart): Fix bug in use of the
  semi org-mime-library when converting emails to HTML.
org-macs: Remove restriction when locating markers

* org-macs.el: Remove restriction when locating markers

Allows org-with-point-at to locate point outside the current
restriction.
org-agenda.el (org-entries-lessp): Fix inactive timestamp comparison

* org-agenda.el (org-entries-lessp): Fix inactive timestamp
comparison.
org-agenda.el (org-cmp-ts): Fix agenda entry type checking

* org-agenda.el (org-cmp-ts): Fix agenda entry type checking.

Thanks to Trevor Murphy for reporting this.
org.el (org-fontify-meta-lines-and-blocks-1): Fix handling of `org-hidden-keywords'

* org.el (org-fontify-meta-lines-and-blocks-1): Fix handling
of `org-hidden-keywords'.

Thanks to Leu Zhe for reporting this.
org-agenda.el (org-agenda-filter-apply): Fix setting of `org-agenda-filtered-by-category'

* org-agenda.el (org-agenda-filter-apply): Fix setting of
`org-agenda-filtered-by-category'.
ox-koma-letter.el (koma-letter): Use `org-koma-letter-from-address'

* ox-koma-letter.el (koma-letter): Use
`org-koma-letter-from-address'.

TINYCHANGE
org.el: Delete `org-fix-ellipsis-at-bol'

* org.el (org-fix-ellipsis-at-bol): Delete.
(org-mode, org-show-context, org-isearch-end): Don't use
`org-fix-ellipsis-at-bol'.
Fix typos: backport revision r117377 from emacs trunk
ox-ascii: Fix tables with a width cookie

* lisp/ox-ascii.el (org-ascii--table-cell-width): Correctly export
  tables with width cookies.
org-clean-before-export matches non-special columns spuriously

* org-table.el (org-table-clean-before-export): The regexes match
  spaces in addition to the special characters that might be used in
  the first column as special marking characters.  Remove the space
  from the character class.

  In addition, the `special' variable included a backslash which
  afaict does nothing: delete it.

  The function itself takes an optional parameter which is not used by
  any of the callers: get rid of it.  Getting rid of it allows a small
  simplification of the code.

The bug was found by Thorsten Grothe:

    http://thread.gmane.org/gmane.emacs.orgmode/88634