hbisect.get: use simpler code with repo.set(), fix 'pruned' set Use repo.set() wherever possible, instead of locally trying to reproduce complex graph computations. 'pruned' now means 'all csets that will no longer be visited by the bisection'. The change is done is this very patch instead of its own dedicated one becasue the code changes all over the place, and the previous 'pruned' code was totally rewritten by the cleanup, so it was easier to just change the behavior at the same time. The previous series went in too fast for this cleanup pass to be included, so here it is. ;-) Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>