added recover option to Sleepycat's open method
added recover option to Sleepycat's open method

ssssam/rdflib,yingerj/rdflib,marma/rdflib,yingerj/rdflib,RDFLib/rdflib,yingerj/rdflib,avorio/rdflib,RDFLib/rdflib,RDFLib/rdflib,avorio/rdflib,ssssam/rdflib,yingerj/rdflib,dbs/rdflib,ssssam/rdflib,RDFLib/rdflib,armandobs14/rdflib,armandobs14/rdflib,dbs/rdflib,armandobs14/rdflib,ssssam/rdflib,marma/rdflib,avorio/rdflib,armandobs14/rdflib,marma/rdflib,dbs/rdflib,dbs/rdflib,marma/rdflib,avorio/rdflib