reaction widths deleted by autolayout

[luciansmith]

The reaction dimension width does not persist across calling autolayout:

            ret1 = LIBSBMLNETWORK_CPP_NAMESPACE::setReactionDimensionWidth(sbml, 0, xval);
            double width = LIBSBMLNETWORK_CPP_NAMESPACE::getDimensionWidth(sbml, "J0");
            LIBSBMLNETWORK_CPP_NAMESPACE::autolayout(sbml, m_autolayout.maxNumConnectedEdges);
            width = LIBSBMLNETWORK_CPP_NAMESPACE::getDimensionWidth(sbml, "J0");

'width' starts off at what it was set, and after autolayout is called, it's then zero.

[adelhpour]

This needs to be fixed along with the one at issue #16. It seems that the autolayout does not keep reaction info. I'll work on it.

[luciansmith]

Another problem: if a reaction is defined with multiple curve segments, the later ones seem to get deleted as well.