Update header information.

Those three files will be part of Emacs when Org 8.0
will be merged with Emacs trunk.

Thanks to Nick Dokos for pointing this.
org.texi: Update the list contributions

* org.texi: Update the list contributions.
Update headers.
Reverting "Fix compiler warning."

This reverts commit da22d29eb215d360fd0b71f1e0ebb54cb63ca9bb.
Replace `time-to-seconds´ with `org-float-time´

* lisp/org.el (org-current-time): Replace call to obsolete function
  `time-to-seconds´ with a call to compatibility function
  `org-float-time´.

XEmacs 21.5 already has float-time, so we may not need a compatibility
function here depending on what version of XEmacs introduced it and
what is the earliest version that Org is supposed to still support.
ob-python.el: Use a defcustom for two variables.

* ob-python.el (org-babel-python-command): Use a defcustom.
(org-babel-python-mode): Use a defcustom and default to
'python-mode when featured.

Thanks to Andreas Röhler for providing a prelimiary patch.
ox: Fix coding system error

* lisp/ox.el (org-export--generate-copy-script): Clone
  `buffer-file-coding-system' when creating a buffer copy.

This patches makes sure the output will share the same encoding as the
original buffer.
Merge `org-with-buffer-modified-unmodified' into `org-unmodified'

* org.el (org-entry-blocked-p): Use `org-unmodified' instead
of `org-with-buffer-modified-unmodified'.
(org-agenda-prepare-buffers): Fix indentation.

* org-macs.el (org-unmodified): Rename from
`org-with-buffer-modified-unmodified'.
(org-with-buffer-modified-unmodified): Delete.
Merge branch 'master-wip'
ox-latex.el (org-latex-toc-command): Don't add vertical space after the table of contents

* ox-latex.el (org-latex-toc-command): Don't add vertical
space after the table of contents.

Let the user decides about such aesthetic issues.
ox-latex.el (org-latex-format-headline-default-function): New option

* ox-latex.el (org-latex-format-headline-default-function):
New option.
(org-latex-format-headline-function): Use the new option as
the default value.

The rationale here is that most users will expect Org 8.0
to format headlines like Org <8.0 did.  If they want a different
formatting, then they can use `org-latex-format-headline-function'.
Fix typo: an headline -> a headline.
org.texi (@LaTeX{} fragments): Minor enhancement

* org.texi (@LaTeX{} fragments): Minor enhancement.
ox-latex: Set inputenc option according to `org-export-coding-system'

* lisp/ox-latex.el (org-latex-guess-inputenc): Set inputenc option
  according to `org-export-coding-system'.
ox-publish.el (org-publish-sitemap-date-format): Small docstring enhancement

* ox-publish.el (org-publish-sitemap-date-format): Small
docstring enhancement.
Merge branch 'master' of orgmode.org:org-mode
org.el (org-tsr-regexp-both): Don't activate dates in links

* org.el (org-tsr-regexp-both): Don't activate dates in links.
(org-activate-dates): Change match boundaries according to the
new value of `org-tsr-regexp-both'.

Thanks to Richard Huang for reporting a related issue.
Merge branch 'maint'
Use `with-silent-modifications' instead of `org-unmodified' when it makes sense

* org-macs.el: Add a comment on when to use `org-unmodified'
and when to use `with-silent-modifications'.

* org-colview.el (org-columns-display-here)
(org-columns-remove-overlays, org-columns-quit)
(org-columns-edit-value, org-columns-compute-all)
(org-columns-compute, org-agenda-colview-compute):
* org-clock.el (org-clock-sum):
* org.el (org-refresh-category-properties)
(org-refresh-properties, org-entry-blocked-p)
(org-agenda-prepare-buffers): Use `with-silent-modifications'
instead of `org-unmodified'.

Thanks to Stefan Monnier for reminding me about `with-silent-modifications'!
ox-publish: No error when resolving external fuzzy links outside publishing

* lisp/ox-publish.el (org-publish-resolve-external-fuzzy-link): No
  error when resolving external fuzzy links outside publishing.  Though
  search option for these links will not be resolved.