Update SBMLUtil.java
Update SBMLUtil.java

Now, this class uses methods from JSBML's `SBO` class where this is possible, rather than redefining identical terms. Also, instead of strictly translating one SBO term to its corresponding `String` representation, it now uses the method `SBO.isChildOf` that also accepts more specific terms than the one given. This can be crucial when converting arbitrary SBML files to CellDesigner.
funasoul/celldesigner-parser,funasoul/celldesigner-parser