new preferred name, Syriac descriptions, etc.

I altered how the Syriaca.org preferred name is designated by
@resp="http://syriaca.org" rather than having the place URI in the
@source attribute.  I added <state type="existence"> elements to each
place.  I replaced the "Barsoum Syriac" place-holder with the actual
Syriac title for Dolabani's translation of Syriac.  I entered the Syriac
descriptions where they are available.  I marked up the place names in
the Barsoum English description of Serugh (45.xml) with links to the
places named.  I updated the publication date in each place.  In Edessa
(78.xml) I marked up 3 possible ways of encoding notes to future editors
with work needing to be done.  In Edessa (78.xml) I also marked up the
attestation method we agreed upon, but the attestations are fictional.
Both the extraneous (non-chosen) future revision note methods and the
attestation structure will need to be pulled out of 78.xml
Merge branch 'master' of https://github.com/paregorios/srpdemo1