Issues: reversability

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Making entries reversable is tricky:

<entry id="a7602" lemma="nakawanaka" hom="1" hist="v99">
.
.
<tg lang="eng">
  <tr><rev>wound</rev> <mod>oneself</mod> (accidentally)</tr>
</tg>

The above should produce a (sub-)entry for wound in the reverse list such as:

wound (v)
 1. wound oneself - nakawanaka