org-entities.el: Fix display of pretty entities

* org-entities.el (org-entities-help): Prevent the display of
pretty entities, as this help buffer is meant to list literal
strings, not utf-8 representations.

Thanks to Brice Waegenire for reporting this.
Merge branch 'maint'
ob-python.el (org-babel-python-var-to-python): Fix code typo

* ob-python.el (org-babel-python-var-to-python): Fix code typo.

Thanks to Daniel Gerber for reporting this.
Merge branch 'maint'
update psql command to respect :colnames

Suggested by Joost Helberg on the Mailing list.

TINYCHANGE

* lisp/ob-sql.el (org-babel-execute:sql): Update psql command to
  respect :colnames.
Revert "ob-python.el (org-babel-python-var-to-python): Fix code typo"

This reverts commit e88d9d7caf75994c00c1f7c95180aac672696eb2.
Merge branch 'maint'
ox-md: Prevent error with empty items

* lisp/ox-md.el (org-md-item): Do not return an error when exporting
  an empty item.
Merge branch 'maint'
Merge branch 'master' of orgmode.org:org-mode
Backport typo fixes from Emacs revno r115923
Merge branch 'maint'
org-table.el (org-table-fix-formulas): Fix commit eb28fe

Thanks to Michael Brand for reporting this.
Merge branch 'maint'
org-element: Fix `org-element-at-point' at eob

* lisp/org-element.el (org-element-at-point): Return appropriate value
  when point is at end of buffer and a cached element was found above.
Fix multiple TBLFM

Simplify commit release_8.2.4-14-geb28fe4 and commit
release_8.2.5c-8-ga2619b7.

* org-table.el (org-table-fix-formulas): Handle multiple #+TBLFM lines
with `forward-line'.
Merge branch 'maint'
ob-core: Speed improvement

* lisp/ob-core.el (org-babel-get-inline-src-block-matches): Do not
  compute line number if all is needed is to know if we're on the
  first one.
Merge branch 'maint'
org.texi: Fix some sections subtitiles

* doc/org.texi (Top, Exporting): Org has its own documentation and
  should therefore be removed from "Other build-in back-ends".