OrgOdtStyles.xml, OrgOdtContentTemplate.xml: Refresh
* etc/styles/OrgOdtContentTemplate.xml (OrgIndexSection): New.
* etc/styles/OrgOdtStyles.xml (Heading): Add tabstop.
(OrgVerse): Modify background color.
(OrgFixedWidthBlock, Horizontal_20_Line): Modify border thickness.
(OrgTodo, OrgDone): Remove foreground color.
(OrgTag): Remove background color, use small caps.
(OrgClock, OrgClockLastLine, OrgPlanning, OrgTags)
(OrgPriority, OrgPriority-A, OrgPriority-B, OrgPriority-C)
(OrgTimestamp, OrgActiveTimestamp, OrgInactiveTimestamp)
(OrgScheduledKeyword, OrgDeadlineKeyword, OrgClockKeyword)
(OrgClosedKeyword, OrgDate): New styles, for use with the new
exporter.