org-agenda.el (org-agenda-custom-commands): Fix default setting

* org-agenda.el (org-agenda-custom-commands): Fix default
setting so that the customize interface does not complain
about a mismatch.
org-agenda.el: Don't hardcode the default agenda entry types

* org-agenda.el (org-agenda-entry-types): Move earlier in the file.
(org-agenda-custom-commands-local-options, org-diary)
(org-agenda-get-day-entries): Don't hardcode the default
agenda entry types, use `org-agenda-entry-types'.
org-agenda.el (org-agenda-Quit): Set `org-agenda-buffer' to nil

* org-agenda.el (org-agenda-Quit): Set `org-agenda-buffer' to
nil.  This prevents bugs when calling e.g., `org-diary' after
quitting an agenda window.
org-list.el (org-insert-item): Don't ask for a definition term

* org-list.el (org-insert-item): Don't ask for a definition
term when insert an item in a description list.

This breaks the type-flow way too much.
org-agenda.el (org-agenda-mode-map): Use ?= for filtering by regexp and ?| for removing all filters

* org-agenda.el (org-agenda-mode-map): Use ?= for filtering by
regexp and ?| for removing all filters.
(org-agenda-filter-remove-all): New command.
(org-agenda-filter-show-all-re): Rename from
`org-agenda-filter-show-all-regexp'.
(org-agenda-filter-by-regexp): Call
`org-agenda-filter-show-all-re'.
Apply changes to slideshow exporter to use new `org-html-divs'
specification.

* contrib/lisp/ox-deck.el:
  - Rename header/footer options and methods to preamble/postamble to
  be more consistent with underlining html exporter. Also remove
  included wrapper section to allow for using the element specified in
  `org-html-divs'.
  - add `org-deck-preamble-postamble-styles' variable
  - Rename `org-deck-title-page-styles' to `org-deck-styles'.
  - Rename `org-deck-title-page-* to `org-deck-title-slide-*'

(org-deck-template):
        - use :html-doctype instead of forcing html5.
        - use xhtml valid meta charset tag
        - Use elements specified in `org-html-divs'.
        - Cleanup embeded css (move into a single style section)

* contrib/lisp/ox-s5.el:
  - Use `org-html-div' container class for content
  - Change header/footer templates to remove wrapper from
  customization string.
(org-s5-toc): Use :html-container instead of hard-coded div.
(org-s5-template): use :html-doctype, :html-container and
`org-html-divs' container class.
whitespce cleanup
Update s5 and deck,js slideshow exporters to work with refactored html
backend.

* lisp/ox-html.el (org-html--build-pre/postamble): Add css class to
  wrapper div (defaults to `org-pre/postamble-class').  Move spec
  building to separate function (`org-html-format-spec').
(org-html-format-spec): New function.
(org-pre/postamble-class): New variable.

* contrib/lisp/ox-deck.el: Replace :html-{pre,post}amble export
  options with :deck versions.
(org-deck-postamble): Replaces `org-deck-postamble-template', uses
format-spec (and `org-html-format-spec') instead of custom template
option.
(org-deck-preamble): Replaces `org-deck-postamble-template', uses
format-spec (and `org-html-format-spec') instead of custom template
option.
(org-deck-title-slide-template): Use standard format specs.
(org-deck-template): Use org-html--build-pre/postamble instead of
`org-deck-fill-template'. Use fill-template for title slide (with
standard format specs) instead of custom `org-fill-template'
(org-deck-template-alist):  Delete.
(org-deck-postamble-template): Delete.
(org-deck-preamble-template): Delete.

* contrib/lisp/ox-s5.el: Same overall set of changes as ox-deck.
(org-s5-divs): New option, similar usage to `org-html-divs'.
(org-s5-footer-template): Delete.
(org-s5-header-template): Delete.
Test the org-open-at-point function.

* testing/examples/open-at-point.org: new file.
* testing/lisp/test-org-open-at-point.el: new file.

This tests only the function when inside or before bracket links
and plain links.
Merge branch 'master' of orgmode.org:org-mode