ox-html: attributes lines are more comprehensive
* lisp/ox-html.el (html): Rename :html-table-tag property
into :org-table-attributes.
(org-html-table-default-attributes): New variable.
(org-html-table-tag): Removed variable.
(org-html--make-attribute-string): New function.
(org-html-link--inline-image, org-html-table): Use new function.
* doc/org.texi: Document variable changes.
It is now possible to write properties and values in attributes lines
without falling back on `:options':
#+attr_html: :border 1
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