set of DNA sequences.
+BUG FIXES
+
+ o root() failed with 'resolve.root = TRUE' when the root was
+ already the specified root.
+
+ o Several bugs were fixed in mlphylo().
+
+ o collapsed.singles() did not propagate the 'Nnode' and
+ 'node.labels' elements (thanks to Elizabeth Purdom for the fix).
+
+ o read.nexus failed to remove correctly the comments within trees.
+
+
OTHER CHANGES
o unique.multiPhylo() is faster thanks to a suggestion by Vladimir