org.el (org-mode): Set `paragraph-start'

* org.el (org-mode): Set `paragraph-start'.

The value inherited from outline-mode is wrong because
outline mode does not enforce the space after the star
while Org-mode does.

outline-mode value for `paragraph-start' prevents filling
paragraphs containing a string like " -- *bold*": in this
case, fill-paragraph might think that the "*b" part of the
string starts a paragraph while it does not.

Thanks to Samuel Wales for reporting this.
Merge branch 'maint'
ox-html.el (org-html-headline): Add comment

* ox-html.el (org-html-headline): Add comment.

The comment explains why commit
http://orgmode.org/cgit.cgi/org-mode.git/commit/?id=1f591b
is needed.
ox-html: Fix infojs integration

* lisp/ox-html.el (html): Add infojs installation script in options
  filter.
(org-html-infojs-install-script): Remove check for back-end as we can
safely assume the function will be called from `html' back-end or one
of its derivative.

`org-export-filter-*-functions' are user oriented. Developer filters
should be installed in back-end definition.
ox-html: Silence byte-compiler

* lisp/ox-html.el (org-html-link): Silence byte-compiler.
ob-tangle: Correctly unescape code when tangling

* lisp/ob-tangle.el (org-babel-spec-to-string): Use dedicated function
  for unescaping code.
Add (provide ...) forms.

E.g., if a user requires the 'org-icalendar feature,
he really wants to load 'ox-icalendar if it's in her
load-path.
Remove contrib/oldexp/.

If users want to use the old exporter, they now need
to checkout an earlier version of Org.
org-agenda.el (org-agenda-filter-apply): Deactive `org-agenda-entry-text-mode' when filtering

* org-agenda.el (org-agenda-filter-apply): Deactive
`org-agenda-entry-text-mode' when filtering.
(org-agenda-entry-text-mode): Don't allow in filtered views.
Don't show the maximum number of lines when turning off.

Thanks to Sébastien Vauban for pointing a related issue.
org.el (org-deadline, org-schedule): Set the warning/delay relatively to the timestamp

* org.el (org-deadline, org-schedule): When called with two
universal prefix arguments, set the warning time or the delay
relatively to the current timestamp, not to today's date.

Thanks to Sébastien Vauban for reporting this.
Merge branch 'maint'
Merge branch 'master-fixes-8'