Convert TEI XML files to FASTT format

Each XML file should have:

1. A siglum (<idno type="siglum">[siglum]</idno> or <text corresp="#[siglum]">)
2. For each paragraph or verse to be collated, an xml:id (e.g., <p xml:id="[id]">, <lg xml:id="[id]">

Convert!