Add a README for the generated dbschema diagrams.

Add three more dbschema diagrams to replace the deleted PDF versions.

diff --git a/doc/README.dbschema b/doc/README.dbschema
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+There are database diagrams in the 'doc/dbschema' folder. These are
+not authoritative, but if they are incorrect, that should be
+considered a bug.
+
+The diagrams were generated with pgModeler <http://www.pgmodeler.com.br/>.

diff --git a/doc/dbschema/Injuries_Detail_XML.png b/doc/dbschema/Injuries_Detail_XML.png
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diff --git a/doc/dbschema/injuriesxml.png b/doc/dbschema/injuriesxml.png
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diff --git a/doc/dbschema/newsxml.png b/doc/dbschema/newsxml.png
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