add more complex connections tests (nineVariablesTenConnections, threeMapVariablesConnectionOneDuplicate)
add more complex connections tests (nineVariablesTenConnections, threeMapVariablesConnectionOneDuplicate)

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