Update on S4Vectors issue
Code tidying
Remove updateObject,GTuples-method and updateObject,GTuplesList-method and update NAMESPACE
Fix as.data.frame on empty GTuples
Fix tuples<-,GTuplesList-method when GTuples are empty
Code tidying
Add test of IPD on empty GTuples object
Test GTuplesList subsetting
Test deconstruction/reconstruction of GTuplesList
Other tests of GTuplesList