An example in main.c which creates a new relation "person" and adds two tuples and then prints person, relcat, attrcat.
Major bug fix: create.c:25 OpenRel gives either NOTOK or relNum. So to check the presence of a relation we have to check != NOTOK. (It was ==OK, so fails when a valid relNum is returned).
Clean up and minor bug fixes in openrel.c