clarify what taking a component is meant to achieve
clarify what taking a component is meant to achieve

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