working on making reigns into states

Reign dates used to generate events.  Now they generate states.  But
there are a few bugs left to work out.
Changed reign to state not event

Reign dates now inform a <state> which is made for any other title, or
if no other <state> is made, reign dates create a <state> of
@type="office".  I also modified the multiple-sources template which I
created in module source.xsl to remove duplicates.