+NEW FEATURES
+
+ o The new function extract.clade extracts a clade from a tree by
+ specifying a node number or label.
+
+ o fastme.bal() has two new options 'spr' and 'tbr' to perform tree
+ operations of the same names.
+
+ o dist.dna() can now return the number of site differences by
+ specifying model="N".
+
+