Full selection of non-composite clusters in CCMC.
Full selection of non-composite clusters in CCMC.

Testing indicates this algorithm is substantially more stable if the
population on the reference is low.

This is a clean implementation of an original idea and experimental
implementation by Alex Thom with tidying/optimisation by James Spencer
and testing by Will Vigor.

hande-qmc/hande,hande-qmc/hande,hande-qmc/hande,hande-qmc/hande,ruthfranklin/hande,hande-qmc/hande