bugfixes for use-case tests 1.xi.a-1.xi.c: 'invalid_name' to 'invalid name'; variable serialisation
bugfixes for use-case tests 1.xi.a-1.xi.c: 'invalid_name' to 'invalid name'; variable serialisation

cellml/libcellml,nickerso/libcellml,cellml/libcellml,libcellml/buildbot-testing,hsorby/libcellml,nickerso/libcellml,libcellml/buildbot-testing,hsorby/libcellml,hsorby/libcellml,MichaelClerx/libcellml,nickerso/libcellml,hsorby/libcellml,MichaelClerx/libcellml,cellml/libcellml,nickerso/libcellml,MichaelClerx/libcellml,cellml/libcellml