rfe12546 - added getDuplicateStatements to python API doc
rfe12546 - added getDuplicateStatements to python API doc

Also added deleteDuplicateStatements which was defined but not
documented.

Change-Id: I25590a72d9368850a4180fd9ab97fb807b1aea44
Reviewed-on: https://gerrit.franz.com:9080/4224
Reviewed-by: Ahmon Dancy <8f7d8ce2c6797410ae95fecd4c30801ee9f760ac@franz.com>
Reviewed-by: John O'Rourke <090daf49d68aa48f3089db880627955a30371233@franz.com>
Tested-by: Kevin Layer <d54c2aa2f61603022c71493f093f0c718419ca13@franz.com>

franzinc/agraph-python,franzinc/agraph-python,franzinc/agraph-python,franzinc/agraph-python