Remove check on cellml identifier for ci elements inside a bvar element.
Remove check on cellml identifier for ci elements inside a bvar element.

cellml/libcellml,MichaelClerx/libcellml,MichaelClerx/libcellml,nickerso/libcellml,nickerso/libcellml,cellml/libcellml,cellml/libcellml,hsorby/libcellml,hsorby/libcellml,MichaelClerx/libcellml,hsorby/libcellml,hsorby/libcellml,cellml/libcellml,nickerso/libcellml,nickerso/libcellml