ob-sh: detect tables correctly

* lisp/ob-sh.el (org-babel-sh-var-to-sh): When detecting a table, the
  first line could be the symbol `hline' rather than a list of table
  cells, so check for that as well.

Thanks to Paul Stansell for pointing out the error.
Merge branch 'maint'
Adding Skim.app support to org-mac-link-grabber.el

* The shortcut is set to [S]

* Grabs not just the link to file, but a page

* Inserts the selected text as a description, if present. Otherwise
  inserts "<filename>, p. <page #>"

* Defines a new "skim" link type
Fixing a bug in as-mac-firefox-get-frontmost-url

Prior to the fix the firefox link grabber won't work correctly if a cursor has been already positioned in the URL field. The fix works by adding an additional keystore for selecting all the text in that field.
Automatic detection of the presence of Skim.app

Automatically detect whether the option for Skim.app should be enabled
by default or not. Thanks to Ivan Andurs.
Add the ability to highlight the selected text in Skim.app

Make a 'highlight note' upon grabbing a link from Skim.app if the
option 'org-mac-Skim-highlight-selection-p' is t.
org.el (org-refresh-properties): Put the text property on the whole subtree, not just on the headline

* org.el (org-refresh-properties): Put the text property on
the whole subtree, not just on the headline.

Thanks to Ivan Kanis for reporting this and to Miguel Ruiz for confirming
the bug.
Merge branch 'maint'
ox-html: Fix org-export-string-as when org-html-with-latex is dvipng

* lisp/ox-html.el (org-html-format-latex): Provide a prefix for
  temporary file when using dvipng, even if the current buffer isn't
  associated to a file.
Merge branch 'maint'
org-table.el: Rename a variable and a function

* org-table.el (org-table-TBLFM-begin-regexp): Rename from
`org-TBLFM-begin-regexp'.
(org-table-calc-current-TBLFM): Rename from
`org-calc-current-TBLFM'.

* org.el (org-ctrl-c-ctrl-c): Require org-table if needed.
org.el (org-set-regexps-and-options): Fix regexps

* org.el (org-set-regexps-and-options): Fix
`org-deadline-time-hour-regexp' and
`org-scheduled-time-hour-regexp'.

Thanks to Nick Daly for reporting this.
Fix tests wrt commit 0c31a4fc
Merge branch 'maint'