updated headers

Added "The Syriac Gazetteer" as a <title level="m"> to the <titleStmt>,
changed the TEI's URI to end in /tei, added Barsoum license information
to our <license> statement, added CBSC links as <idno> elements, and
changed CBSC <bibl> elements to put the entries with links in the
<citedRange> elements with @target pointing to the URL.