unique names

Now instead of having a <persName> for every source which provides name
content, we have a <persName> for every unique name form.  This means
the @source can have multiple hits, the @corresp can correspond to both
Barsoum family and Abdisho family hits, the @xml:id no longer has "a"
and "b" suffixes to distinguish vocalized from unvocalized.  KNOWN BUG:
right now some Syriac headwords are not getting the syriaca-headword tag
(e.g. Daniel of Salah, person/59).
fixed missing syriac headword bug

I fixed the bug reported in the last commit, that some persons (e.g.
Daniel of Salah, person/59) were missing the syriaca-headword tag from
their Syriac headword name.