Added Barsoum English to license info
Added CBSC see also links

Also new data from spreadsheet populated in
Added errata notes
Enabled links in abstracts

I had been encoding certain <placeName> and <persName> links in the
spreadsheet cells for abstracts.  I had thought they were getting out to
the TEI, but instead they were being flattened by <xsl:value-of>, while
<xsl:copy-of> would reproduce the parent element (undesired), and
<xsl:for-each select="child::node()"> introduced hideous @xmlns=""
attributes.
Added deprecation notes and links

Also new data from spreadsheet cleaning up the Syriac and Arabic notes,
and moving a few Syriac deprecation notes out of the Syriac Description
column where I had erroneously placed them!  Finally, I no longer need
to curate 518.xml by hand since the deprecation is now handled by the
XSLT, so I deleted Examples/518.xml