- Add conversion of integers and doubles

src/qir/ast/QIRNode.java

src/qir/ast/data/QIRTable.java

src/qir/ast/operator/QIRGroup.java

src/qir/ast/operator/QIRJoin.java

src/qir/ast/operator/QIRLimit.java

src/qir/ast/operator/QIROperator.java

src/qir/ast/operator/QIROrder.java

src/qir/ast/operator/QIRProject.java

src/qir/ast/operator/QIRScan.java

src/qir/ast/operator/QIRSelect.java

src/qir/driver/SQLDriver.java