* ox.el (org-export-with-title): New variable.
* ox (org-export-options-alist),
ox-ascii.el (org-ascii-template--document-title),
ox-beamer.el (org-beamer-template), ox-html.el (org-html-template),
ox-latex.el (org-latex-template), ox-man.el (org-man-template),
ox-odt.el (org-odt-template), ox-org.el (org-org-template),
ox-publish.el (org-publish-project-alist),
ox-texinfo.el (org-texinfo-template),
ox-groff.el (org-groff--mt-head): Use new variable.
* ox-koma-letter.el (org-koma-letter-use-title): Mark obsolete.
* test-ox.el (test-org-export/parse-option-keyword): Add :with-title.
* ORG-NEWS, org.texi: Mention org-export-with-title.
This is useful in e.g. ox-html where title can be set via
`org-html-preamble-template' or when using the {{{title}}}-macro.
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