Improve detection of requirements for Python coverage.
Improve detection of requirements for Python coverage.

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