ox-odt: Support for typesetting Description lists as in LaTeX
* etc/styles.OrgOdtStyles.xml (OrgDescriptionTerm)
(OrgDescriptionDefinition): New styles for typesetting
description lists.
* lisp/ox-odt.el (org-odt-description-list-style): New user option.
(org-odt--translate-description-lists/html): Renmed from
`org-odt--translate-description-lists. Use new style
"OrgDescriptionTerm". Update comments.
(org-odt--translate-description-lists/latex): New.
(org-odt-bold): Add an internal `:style' property.