1. Add links from topic in <relrow> to topic in <relheader> and vice versa.
We should update the maplinkImpl.xsl to support this requirement, add the new links to maplinks.unordered in the right format. We can assign the new generated links to the role of friend, but we may also don't. If we don't, we should think about a new role to name it.
Element <relcell> and <relcolspec> may contain more than one topics, and the topics can be nested and paralleled, the spec of this requirement is not clarity about this situation, we are not clear about this.

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