Utilities: moved `isSameOrEquivalentVariable()` to `AnalyserModel`.
Utilities: moved `isSameOrEquivalentVariable()` to `AnalyserModel`.

nickerso/libcellml,cellml/libcellml,cellml/libcellml,nickerso/libcellml,hsorby/libcellml,nickerso/libcellml,hsorby/libcellml,nickerso/libcellml,hsorby/libcellml,cellml/libcellml,hsorby/libcellml,cellml/libcellml