gagolews/quitefastmst: quitefastmst_0.9.1

0.9.1 (2026-02-11) [NEW FEATURE] The mutreach_leaves argument to mst_euclid controls the postprocessing of tree leaves. [BACKWARD INCOMPATIBILITY] The definition of the mutual reachability distance has changed (for notational prudence). Unlike in Campello et al.'s 2013 paper, now the core distance is the distance to the M-th nearest neighbour, not the (M-1)-th one (not including self). [BACKWARD INCOMPATIBILITY] The mutreach_adj argument to mst_euclid was removed. Instead, the mutreach_ties argument is now available. It defaults to "dist_min" for (rough) compatibility with other packages. [BUGFIX] #3: SIGSEGV on duplicated inputs in mst_euclid with algorithm="brute" was fixed.