Reconcile the uses of xml:id that obsolete an ID attribute from ODF 1.1

For 19.809.6 and 19.809.8: Delete: "OpenDocument consumers shall ignore a text:id attribute if it occurs on a <text:h> element with an xml:id attribute value. If there is no xml:id attribute value, then a text:id attribute should be processed as it were an xml:id attribute. OpenDocument producers may write text:id attributes for <text:h> elements in addition to an xml:id attribute. A <text:h> element shall not have an text:id attribute if it has no xml:id attribute value. The value of a text:id attribute shall equal the value of an xml:id attribute on the same <text:h> element. The text:id attribute is deprecated in favor of xml:id. 19.916" Insert: "OpenDocument consumers shall ignore a text:id attribute if it occurs on an element with an xml:id attribute value. OpenDocument producers may write text:id attributes for elements in addition to an xml:id attribute. The value of a text:id attribute shall equal the value of an xml:id attribute on the same element. The text:id attribute is deprecated in favor of xml:id. 19.916" For 19.809.5: Recast first paragraph to read: "The text:id attribute specifies an identifier for an element." Insert the new material of 19.809.6 Keep the paragraph starting: "The ID value is used..." Delete the paragraph starting "The text:id attribute...." Delete the final note. For 19.7 (anim:id), 19.187.3 (draw:id), 19.276 (form:id) and 19.809.2 Delete the sentence starting "When consuming OpenDocument v1.0 and v1.1 documents,"