div commentary in HGV files

[jcowey]

Since the field Bemerkungen (in HGV) / commentary in papyri.info has always belonged to a standard HGV record, I have added a new row to (why I forgot about it I am not sure, anyway it is now needed in a submission)

https://github.com/jcowey/P3/blob/master/guidelines/metadataMask.md

with the commit: jcowey/P3@45c423c

This would require at least an update to

https://github.com/hcayless/P3-processing/blob/main/xslt/process-tei-2.xsl

Using e.g. https://github.com/papyri/idp.data/blob/master/HGV_meta_EpiDoc/HGV90/89155.xml#L77-L79

as a model, after https://github.com/hcayless/P3-processing/blob/main/xslt/process-tei-2.xsl#L353

I think you will need to incorporate something like

<xsl:if test="fn:has-value(t:table[1],'Commentary')"><div type="commentary" subtype="general">
  <p><xsl:value-of select="fn:get-value(t:table[1],'Commentary')"/></p>
</div></xsl:if>

That may suffice (if it is correct, please check), but maybe other places in the code also require attention.