Added hook for SQL union quirk when querying across 3 tables (in some situations when pulling from the rdf:type table in addition to the other tables, the context comes back as '0' and the objDatatype comes back as the context.  This seems like a MySQL inconsistency)
Added hook for SQL union quirk when querying across 3 tables (in some situations when pulling
from the rdf:type table in addition to the other tables, the context comes back as '0' and the
objDatatype comes back as the context.  This seems like a MySQL inconsistency)

All stored terms are escaped

fixed open logic to behave properly when the store already exists.  The destroy method only
drops the triple tables (instead of destroying the entire database)

Added missing autocommit=0 statements

Changed union all to union (there should be no duplicates as contexts,formulae statement are
mutually exclusive)

fixed termComb index

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